IIS7 - Performance

Pages appear to stop responding

VorlonShadow — Wed, 04 Mar 2009 16:21:06 GMT

We're running IIS7 on WS08. I have experienced SEVERAL times when I'm accessing a page on this server where it will simply stop responding. The load progress bar will show no progress at all, and after a minute or two, I finally stop it. I can either refresh the browser (which usually immediately brings the page up), or go directly to the page or a different page on the same web site. I have seen this happen on standard html pages as well as asp and asp.net (2.x) pages. It happens most of the time on pages that I've just changed, but I've seen it happen on pages that I have not changed in quite a while.

I have checked the event log when this happens, and there are no entries in there indicating any errors of any kind.

I usually access this server across the network, so instead of a standard "www.mysite.com", I usually do a "http://myserver/myfolder/mypage.htm" sort of thing. But, I believe I've seen this problem when accessing it both ways.

We have some of the same apps running on a WS03 server perfectly.

1) Any idea what is causing this?

2) If there are no ideas, are there any testing methods anyone can suggest to help me figure this out?

Thanks,
Jesse

FTP 7.5 - Slow downloads

mrfrosty — Thu, 19 Nov 2009 16:05:26 GMT

Hello,

I've got an issue which has developed in the last week or so (it had previously been working for months) where downloading files from my web cluster of 2 FTP servers (using FTPES) has just started to grind to a halt, will timeout, reconnect to the server and then proceed to download the file correctly at a good speed.

Uploading files to the servers are fine.

I'm using FTP over explicit mode in Passive mode.

There have been no configuration changes on the servers, only windows updates.

Has anyone seen this before, or suggest anything to attempt to resolve this issue?

Marcus

Maximum concurrent connection to IIS 7

samagrad — Sun, 15 Nov 2009 11:11:47 GMT

Hi,

How many concurrent users can simultaneously connect to IIS 7

Server details

Windows server 2008

IIS 7

.NET 2.0

Maximum concurrent connection to IIS 7

samagrad — Sun, 15 Nov 2009 11:11:28 GMT

Hi, How many concurrent users can simultaneously connect to IIS 7 Server details Windows server 2008 IIS 7 .NET 2.0

IIS 6 to IIS7 Migration Issue

imperalix — Wed, 11 Nov 2009 00:31:56 GMT

I recently migrated from IIS6 on Windows 2003 SP3 to IIS7 Windows 2008 SP2. Our application caches data in memory from a SQL database. We have ran into an issue where we copy new static content to the web servers and it is causing the application to clear it's cache and query the database. I have not seen this behavior with IIS6. Any suggestion on where I should be looking? Thanks.

*.AXD Files Compression in IIS7

wickedw — Sat, 07 Nov 2009 14:58:28 GMT

Hi All,

Can this be done? and is it safe to compress these ajax files using the built in compression!?

Thanks for your help,

Matt

Monitoring bandwidth

nameinuse — Thu, 15 Oct 2009 16:11:24 GMT

Does anyone have a way of monitoring bandwidth usage of IIS7 sites, server 2008, that does not utilize reading logs. I have been looking for a performance counter, and there are some that look close like:

HTTP Service Url Groups -> BytesSentRate but these are tied to instances and I have no idea how to connect the instance to a site.

The problem is that there is a number of sites in my IIS installation, logging on all of them is off, and a few of them are utilizing all of the available ( 2 mb/s) bandwidth. But which ones?

.Net Remoting extremely slow under IIs7

Abhi-LA — Wed, 07 Oct 2009 11:43:16 GMT

I deployed my .Net 2.0 (binary,http) Remoting service application on a new 16 core , 8 GB RAM server. The server is 64 bit, and the application is compiled under Any CPU option. Most of the IIS7 settings are default. The app pool is classis .Net 2.0.

I am running a basic one request-at-a-time remoting client to test the application.The requests are being processed extremely slow. I dont see CPU being used more than 1% on any core. and memory usage is 100 MB for the w3wp process

I run this same application code in production under IIS6, on a 4 core server, with 4GB RAM, the application processes millions of queries a day.

I added some cutom profiling to code and the entire processing of a single request is done within less than 100 milliseconds but the overall response time is more than a second. So I have a feeling its the serialization of the request and response thats taking another 900 ms.

Has anybody tested .Net remoting with IIS7, any special settings needed to get this working?

This is really frustrating as we invested in buying new hardware and installed Windows Server 2008. Any help from Microsoft professionals will be greatly appreciated.

Thanks, Abhi

Compression not working in IIS 7.5

kendomonkey — Sat, 31 Oct 2009 01:45:43 GMT

Hi all, Really struggling with IIS 7.5 - just inherited a Windows 2008 server and can't figure this one out. I have static and dynamic compression enabled but to no effect. All of the sites are configured to compress, the correct folders in the temp location (in my case: C:\inetpub\temp\IIS Temporary Compressed Files) are there but there are no files inside. I've tested whether any static elements (eg. style sheet (text/css)) are being compressed and they're not. Neither are the .php or static .htm files I have set up for the web sites. To be honest, I'm happy to concentrate on trying to get the static compression working - I use a lot of jQuery and need the compression what with all the .js plugins :) Honestly, any help would be much appreciated. I can confirm that I've looked around and followed the very few trails there are. - Both forms of compression are enabled (the modules installed and the tick boxes ticked) - I've used the command line script to print out the compression config and that all looks correct (all settings are enabled) for both the whole config and on a site-specific basis. Sorry if any of this sounds overly-exasperated. I really am very grateful for any help :D Thank you!

wcat errors

acenetat — Wed, 28 Oct 2009 16:08:58 GMT

Hello,

I'm running wcat 6.3 on IIS 7 getting the following results:

Connections: 9677
Disconnects: 9535

Normal Responses: 9535

Status 200: 5414
Status 500: 4121

Total Errors: 4121
Unexpected Status: 4121

Is it possible to find out more details about the errors which occured (error messages etc.)?

Thank you,
Andreas

WCAT 6.3 is not setting or adding cookies to header when server is Apache

DirkTester — Tue, 27 Oct 2009 19:18:48 GMT

Greetings,

[NOTE: I now realize that I mis-categorized this post - probably should have placed it under the "General" performance or tool troubleshooting sections.]

One of our environments is configured to run an instance of Drupal (.php) on an Apache web server.

When using WCAT (Web Capacity Analysis Tool) to execute requests, I've noticed that each request to the web server (even multiple requests in the same transaction) are treated as a unique session. Using Microsoft Network Monitor, I've verified that non of the requests include the expected Cookie in the header.

When I use a browser (IE) to manually execute requests against the same environment, the network monitor confirms that Cookies are included in all requests after the initial request is made.

I've successfully used WCAT against another of our environments, which runs IIS 6 (.net based site): cookies are set and included in request headers.

The WCAT 6.3.1 User's Guide contains the following text: "...The web server software can be any version of IIS, Apache, etc… as long as it is an HTTP compliant web server..."

Do you have any idea why WCAT may not be setting cookies properly when the web server is Apache (which is consistent with the WCAT Users's Guide)? Could it be somehow related to the page being .php?

...Dirk

Speeding Up Response

karbonphyber — Wed, 28 Oct 2009 21:36:16 GMT

Hi all,

This is my first post and i've tried searching for it but the search functionality just doesn't seem to work. =\

So here it is:

I've been reading up on IIS7 running ASP.NET apps for good reason. Reasons are to increase reliability as well as performance. The particular ASP application we're running is DotNetNuke, i'm not sure if IIS7 should be configured uniquely to handle it but so far we've been running DNN on:

its own application pool which sports the following configuration

Integrated pipeline mode
Default of a 1000 queue length
Default Idle Time-out of 20
One (1) Worker Process
Recycling at Regular Time Interval 29hrs
Recycling at Specific Times 0300hrs

Currently I'm pushing for us to allocate time to view the logs created by IIS on traffic so that we can pull figures out from the charts created which could help us with

Keeping these DNN sites alive so they don't have to recompile on request after there's been a long period of inactivity (Time-out)
Increasing the response speed of the site. Our monitoring tools recorded three (3) performance violations in an hour. It was to pick out response times of more than three (3) seconds. This knowledge coupled with the IIS Stats could give us a business reason to drive more visitors in.

I've read that increasing Worker Processes would assist in response time and have read a few testimonials that showed evidence of it obtaining remarkable results and so have increased Worker Processes to 2 for trials.

In the meantime, I've read that InProc session states would not be maintained as each W3WP has it's own boundaries and does not share sessions. Will using ASP.NET's ViewState be affected in any way? In the future, another application that will be deployed, will use simple Sessions. Will that break?

I was hoping to obtain a cleaner site, closer to opening times, so was hoping to recycle at about 7am instead of 3am. Would that help stability at all?

In DNN, there is a KeepAlive.aspx file which refreshes every now and then. The aim was to connect to that page and let it refresh to keep the site alive. It has worked in keeping the site alive and the payload returned is extremely small, which is a plus! Couple this with traffic stats from IIS and we should have an answer as to how long to adjust keep-alive.

Are there any side-effects of increasing keep-alive? I'm guessing that keeping the connection alive for too long would reduce the availability of connections to new visitors?

Now that you know my story...

How should we go about increasing stability and performance?

Worker Processes
Worker Threads - Can we adjust this??
Recycling Times

Thanks Experts!!!!

User WCat with cookies enabled

asumarc — Fri, 05 Jun 2009 00:48:43 GMT

Hi,

I'm doing performance testing on PHPBB3 performance on Window Server 2008 - IIS7. I'm using WCat 6.3 for the performance testing and am having problem because I do not think it works with cookies, the web application creates a new session for each request which cause the database to be highly populated in a short time and the overall performance decreases.

Here is what I have on my scenario file:

default
{
setheader
{
name = "Connection";
value = "keep-alive";
}

setheader
{
name = "Host";
value = server();
}

version = HTTP11;
close = ka;
}

transaction
{
id = "Default Web Site Homepage";
weight = 1;
request
{

url = "/phpBB3/index.php";
statuscode = 200;
cookies = true;
}

Does anyone know where to get this tool in this IIS.Net Video

Cosmopoet — Sat, 24 Oct 2009 03:12:21 GMT

Hello,

I was reading the output cache and then stumbled upon this video

http://learn.iis.net/page.aspx/380/improving-performance-with-native-output-caching/

What tool is he using to measure the sites pages being rendered? It is at counter 1:02

I know that it is a web site stress toll but which one?

Thanks

Joseph

Slow access to IIS7 across tiny LAN

Keep it Simple — Tue, 20 Oct 2009 04:24:50 GMT

On a dedicated test server box, I did a clean install of Windows Server 2008 Enterprise and then IIS7. On the server, I access http://localhost or http://192.168.10.100 and the default IIS7 logo appears instantly.

However, If I access the server box from my Vista Business client machine using http://192.168.10.100 it takes 25 seconds to connect and another 10 seconds to download the graphic.

My understanding is that DNS would not be used because I an entering an IP address. Hence, there is nothing to resolve.

The LAN is a 100 Mbps Full Duplex with only my client computer on the network. There is another Windows file server on the network and accessing it is extremely fast. Browsing the Internet using my Vista machine is very fast as well.

Any ideas why accessing the IIS7 web server across the LAN is soooooo sloooooowwww?

gzip compression doesn 't work for me

graphicsxp44 — Thu, 22 Oct 2009 16:23:07 GMT

Hi,

I want my static content (js, css and images) to be compressed. I've added this to my web.config but no luck, it is still not compressed.

<system.webServer>

what else should I do ?

thanks

Website seems to hang randomly

webnoob — Tue, 13 Oct 2009 13:55:25 GMT

Hi Guys,

I have a dedicated server with IIS7 running on it. My website is setup through IIS but I am getting random hangs. The website is written in ASP.NET. I can't seem to pin point the issue but it seems that if I leave the site for a little while (don't click anything) and then try and click a link, it hangs on "waiting for {domain name}". It can do this for a good while. Sometimes, doing CTRL + F5 will sort the issue and the website loads very fast then but I don't know what could be causing the initial hang.

Any ideas?

A Server Update Severely degrades Performance

skumar2003 — Tue, 20 Oct 2009 18:44:08 GMT

On the 16th of this month our server (64 bit) was updated (automatically) with multiple server updates. One of more of these updates severely degrades the bandwidth throuput of the machine.

This machine is connected to a gigabit pipe to the Internet. Typically we see network utilization of about 500-600MB most times. but after these patches it dropped to 4.5-5MB. User were complaining because they were getting the content at the speeds they were used to (obviously). doing bandwidth test we were able to confirm that something was deffinately wrong. But what?

To cut a long story short, we eventually decided to uninstall the patches that were installed last (5 updates in all) and see if that helps. And it did. It cost us a lot in terms of time, money and customer goodwill, and so I'm posting this here for others.

we have yet to nail it down to one or more of the updates, but here is the list of updates that were uninstalled. Each one is "Important" and each one requires a re-boot.

Security Update for Windows Media Format Runtime 11 for Windows Server 2008 x64 Edition (KB954155)

Security Update for Windows Server 2008 x64 Edition (KB971486)

Security Update for Windows Server 2008 x64 Edition (KB974571)

Security Update for Windows Server 2008 x64 Edition (KB975467)

Security Update for Windows Server 2008 x64 Edition (KB975517)

Of course if anyone knows which one it is, please let me know.

“Unable to connect to remote server fail” in HttpWebRequest

George2 — Wed, 21 Oct 2009 04:53:43 GMT

Hello everyone,

I am using VSTS 2008 + C# + .Net 3.5 to develop a console application and I send request to another server (IIS 7.0 on Windows Server 2008). I find when the # of request threads are big (e.g. 2000 threads), the client will receive error "Unable to connect to remote server fail" when invoking response = (HttpWebResponse)request.GetResponse().My confusion is -- I have set timeout to be a large value, but I got such fail message within a minute. I think even if the connection are really larger than what IIS could serve, client should not get such fail message so soon, it should get such message after timeout period. Any comments? Any ideas what is wrong? Any ideas to make more number of concurrent connection being served by IIS 7.0?

Here is my code,

       class Program
        {
            private static int ClientCount = 2000;
            private static string TargetURL = "http://labtest/abc.wmv";
            private static int Timeout = 3600;

            static void PerformanceWorker()
            {
                Stream dataStream = null;
                HttpWebRequest request = null;
                HttpWebResponse response = null;
                StreamReader reader = null;
                try
                {
                    request = (HttpWebRequest)WebRequest.Create(TargetURL);
                    request.Timeout = Timeout * 1000;
                    request.Proxy = null;
                    response = (HttpWebResponse)request.GetResponse();
                    dataStream = response.GetResponseStream();
                    reader = new StreamReader(dataStream);

                    // 1 M at one time
                    char[] c = new char[1000 * 10];

                    while (reader.Read(c, 0, c.Length) > 0)
                    {
                        Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message + "\n" + ex.StackTrace);
                }
                finally
                {
                    if (null != reader)
                    {
                        reader.Close();
                    }
                    if (null != dataStream)
                    {
                        dataStream.Close();
                    }
                    if (null != response)
                    {
                        response.Close();
                    }
                }
            }

            static void Main(string[] args)
            {
                Thread[] workers = new Thread[ClientCount];
                for (int i = 0; i < ClientCount; i++)
                {
                    workers[i] = new Thread((new ThreadStart(PerformanceWorker)));
                }

                for (int i = 0; i < ClientCount; i++)
                {
                    workers[i].Start();
                }

                for (int i = 0; i < ClientCount; i++)
                {
                    workers[i].Join();
                }

                return;
            }
        }

thanks in advance,
George

Vista IIS7 and connecting to external SQL Timeouts

Toby.Considine — Sat, 17 Oct 2009 15:29:23 GMT

I do my ASP.NET development on my Vista 64 workstation with IIS 7. If the database is local, everything works well. If the database (MSSQL2k5 or MSSQL2k8) is remote, I get timeouts unless everyquery has 5 minutes or more to complete. This makes development / debugging well nigh impossible.

The only error I ever get is timeouts on DB calls.

This does not appear to be a debugger issue (VS2k8) because the behavior is the same if I call up the same pages in IE. The same code runs fine on production servers against the same external DBs. The same conenction strings work fine in console applications (discount network issues).

I am not using trusted connections, so I do not suspect any number of impersonation / Kerb issues.

I can connect to all the databases from console apps using the same connection strings just fine.

I assume it is some sort of over-arching IIS on Vista 64 config issue - but three days of searching have found many others reporting similar problems with nless details, and no answers.

Problems with ASP.Net 3.5

deemurphy — Fri, 16 Oct 2009 00:17:01 GMT

I am running Windows 7 Ultimate and after installing it a few weeks ago I noticed problems with ASP web site. I am using Visual Studio 2008 and Web Developer Express 2008 and having problems.

I am getting this error for the BeerHouse 3.5 - Error 25 It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. C:\inetpub\wwwroot\TheBeerHouse-C-3.5\BeerHouse35\web.config 124

I am getting this error on a new site I am trying to start with a master page - Error 1 It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. C:\inetpub\wwwroot\TrentSetters\Web.config 46

On the Basic page my time and date is not showing. Please let me know what I need to fix.

Thank you

LadyDee

Need help with WCAT 6.3!

salvis — Wed, 11 Mar 2009 22:26:44 GMT

I hope I'm posting in the right place.

I'm have a lot of trouble getting WCAT 6.3 running on my machine.

First Test Machine:

- Windows Vista Business SP1

- IIS 7.0

- command - wcctl.exe -t home.ubr -f settings.ubr

- output

Server: localhost

Clients: 10

Result

The clients never becomes active and the command prompt sits in above state. I have to crtl-c to kill the script.

Second Test Machine:

- Windows Server 2003 R2 SP2

- IIS 6.0

- output

Server: localhost

Clients: 10

Result

Same as above.

I'm using the samples home.ubr script and I altered the settings.ubr script as follows:

add/uncommented:

server = "localhost";

clients = 10;

virtualclients = 100;

What am I missing or doing wrong? Any help would be greatly appreciated.

Thanks,

Scott

IIS7 Reponse slow compare to II6

asifdhk — Thu, 15 Oct 2009 11:28:39 GMT

I use IIS6 in Office, and all my web application work perfectly ok, but when I run the same application at House at my IIS7 in windows7, the application pages take more than 30 second to show and it shows "waiting for localhost" on the Firefox status bar. I tested for Crome and IE too, but all the same. When you type http://127.0.0.1/myapplication in the place of localhost it works better but it slower than my office II6, What's the problem. do I have to change anything in IIS7 setting. Please help me out. I am using ASP.NET 3.5 with Visual Studion 2008 and SQL Server Express 2005.

Thanking you

External requests are really slow! Please help...

empire9 — Wed, 07 Oct 2009 20:44:56 GMT

Hi,

Details:

Windows 2008 Server, IIS7.0, SQL 2008 enterprise, 16 gigs of ram, quadcore Xeon @ 2.5 GHZ, 64bit

I installed a web based application on this server. when i RDP to the server, the web based application runs blazing fast.

When i try to access the same web application from an external machine using the external ip of the server, the same application is super slow!

I also VPNed into the network that the server is on and connected using the internal ip, and its somewhat okay.

I am clueless as to where the problem lays. Please point me to the right direction...Thanks!

Bad performance in .NET app in IIS 7 while load testing with VS Team 2008

ewiesner — Thu, 01 Oct 2009 21:07:31 GMT

Hi. Im load testing a .NET 2.0 application on IIS 7.0 and I'm getting poor performance when testing with step load that eventaully ramps up to 200 concurrent users. The application is all .Net code that calls a webservices SOAP API on another server, which then accesses a SQL database. The database and the SOAP API server seem to run just fine. The problem is with our own application on IIS 7.

The pages at about 80 users average over a minute, and by the time it reaches 100 users, the CPU on a 4 processor box with 6 GB of RAM is eaten up mostly by the corresponding w3wp.exe process (80%) and the system process (20%) . We have tried optimizing the code, and tried manually setting machine.config values. We have downloaded IIS peek, procdump and have looked at several performance counters. Network utilization is very low and all indicators point away from the network. This server is virtualized, yet tests on bare metal hardware with IIS 7 does not prove any better.

Each run through our application is about 300KB and takes 25 seconds without think times.

Any ideas would be appreciated. Thanks.