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• 11-02-2009, 12:54 PM

  pmoo Joined on 11-02-2009, 5:04 PM Posts 5

  400 Bad Request Errors not in HTTPERR Log Reply Contact I have a web service running under IIS 6 on a Windows 2003 SP2 machine.  Approximately 37% of the calls to this service (33K of 88K) result in a 400 error according to the IIS logs. There are no corresponding 400 errors in the httperr log however.  We've also noticed that these errors originate with clients showing the same protocol and user agent combination in the IIS log:   HTTP/1.1 MOZILLA/4.0+(COMPATIBLE;+MSIE+6.0;+MS+WEB+SERVICES+CLIENT+PROTOCOL+1.1.4322.2407)   Interestingly, the same web service interface running on a W2K SP4 machine and IIS5 experiences 500 errors at a 70% rate from exactly the same protocol / user agent combination and the try/catch block at the top of the application does not report any uncaught exceptions.   In both cases, a small percentage of the calls using the same protocol / user agent combination do succeed.

  Tags: HTTP 1.1 400/500 Errors User Agent Specific?

• 11-02-2009, 9:44 PM

  In reply to

  lextm Joined on 10-22-2008, 12:18 AM Shanghai, PRC Posts 1,433

  Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact Unless 400 is recorded in HTTP error logs, it is not likely to be generated by IIS itself. So you'd better review the application if you have its source code. Any dynamic pages, (ASP, ASP.NET) can freely set response status code to whatever they like. About the 500 errors I suspect they come from the pages possibly, but try {} catch {} cannot handle all exceptions. Please check Application event log in Event Viewer to check if there is any records. Lex Li Support Engineer at Microsoft --------------------------- This posting is provided "AS IS" with no warranties, and confers no rights.

• 11-03-2009, 11:00 AM

  In reply to

  tomkmvp Joined on 03-20-2003, 10:27 AM Central NJ Posts 6,254	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact Is there a proxy involved anywhere? Tom Kaminski IIS MVP http://mvp.support.microsoft.com/ http://blogs.iis.net/tomkmvp/ http://www.linkedin.com/pub/8/690/408 http://www.bluesrepublic.org/

• 11-03-2009, 11:07 AM

  In reply to

  pmoo Joined on 11-02-2009, 5:04 PM Posts 5	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact no proxy but the service is behind a load balancer

• 11-03-2009, 11:13 AM

  In reply to

  pmoo Joined on 11-02-2009, 5:04 PM Posts 5	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact the application, as noted, is a web service so there are no "pages" and the code does not set the HTTP status code. Since the sole web service entry / exit point method is wrapped in the noted try/catch block, any uncaught exception within the application code will be trapped if it occurs within that context.

• 11-03-2009, 5:28 PM

  In reply to

  Paul Lynch Joined on 05-24-2006, 9:41 AM UK Posts 1,254

  Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact Hi, That may well be the case but the point being made here is that if a web service hosted by IIS is returning a 400 error then that event will always be recorded in the httperr.log file by the http.sys service. If its not there then the 400 error wasn't generated by the Windows server and may well be coming from a device sitting between the client and the server. Regards, Paul Lynch | www.iisadmin.co.uk

• 11-03-2009, 6:37 PM

  In reply to

  pmoo Joined on 11-02-2009, 5:04 PM Posts 5	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact Paul,   thanks, but as noted the 400 errors are in the IIS log on the server but not the HTTPERR log.  I can see the possibility of the 400 being generated in the MSFT .Net components between IIS and the web service application but this is indeed happening on this platform.

• 11-03-2009, 10:55 PM

  In reply to

  lextm Joined on 10-22-2008, 12:18 AM Shanghai, PRC Posts 1,433	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact I think some IIS tracing logs can help clarify why there are 400 in IIS logs. If you like, you can open a support case via http://support.microsoft.com. Lex Li Support Engineer at Microsoft --------------------------- This posting is provided "AS IS" with no warranties, and confers no rights.

• 11-04-2009, 3:40 AM

  In reply to

  Paul Lynch Joined on 05-24-2006, 9:41 AM UK Posts 1,254	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact   pmoo: thanks, but as noted the 400 errors are in the IIS log on the server but not the HTTPERR log Can you post the relevant extract from the IIS log file ? Regards, Paul Lynch | www.iisadmin.co.uk

• 11-04-2009, 10:01 AM

  In reply to

  pmoo Joined on 11-02-2009, 5:04 PM Posts 5

  Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact sure:  2009-11-04 05:00:11 W3SVC1 SACG1LSIWBA03V 113.128.48.108 POST /ITWBServices/Monitoring/ITWBMonitor.asmx - 80 - 113.128.216.4 HTTP/1.1 Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+1.1.4322.2407) - vwebbh.ebiz.verizon.com 400 0 0 212 3466 312 2009-11-04 05:00:11 W3SVC1 SACG1LSIWBA03V 113.128.48.108 POST /ITWBServices/Monitoring/ITWBMonitor.asmx - 80 - 113.128.216.4 HTTP/1.0 Java1.4.2_17 - vwebbh.ebiz.verizon.com 200 0 0 845 3526 265

• 11-04-2009, 10:10 AM

  In reply to

  Rovastar Joined on 03-13-2008, 2:00 PM London, UK Posts 1,805	Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact I suppose it could be possible that the http.sys is allowing it through and the iis logs are picking it it. You can change the registry setting for what the hhtp.sys would reject. I haven't ever changed this before but here is the procedure: http://support.microsoft.com/kb/820129/en-us http://www.iisportal.com

• 11-04-2009, 9:16 PM

  In reply to

  lextm Joined on 10-22-2008, 12:18 AM Shanghai, PRC Posts 1,433

  Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact No, I don't think http.sys is involved here. Please check the SOAP content to see if there is anything wrong instead. http://www.w3.org/TR/soap12-part2/ According to SOAP protocol the web service will return 400 when it meets a malformed request. This answers why 400 is recorded in IIS logs instead of HTTP error logs. Regards, Lex Li Support Engineer at Microsoft --------------------------- This posting is provided "AS IS" with no warranties, and confers no rights.

• 11-05-2009, 10:13 AM

  In reply to

  tomkmvp Joined on 03-20-2003, 10:27 AM Central NJ Posts 6,254

  Re: 400 Bad Request Errors not in HTTPERR Log Reply Contact pmoo: 2009-11-04 05:00:11 W3SVC1 SACG1LSIWBA03V 113.128.48.108 POST /ITWBServices/Monitoring/ITWBMonitor.asmx - 80 - 113.128.216.4 HTTP/1.1 Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+1.1.4322.2407) - vwebbh.ebiz.verizon.com 400 0 0 212 3466 312 How was this request made? Tom Kaminski IIS MVP http://mvp.support.microsoft.com/ http://blogs.iis.net/tomkmvp/ http://www.linkedin.com/pub/8/690/408 http://www.bluesrepublic.org/