IIS 7 and Above
Last post Jun 08, 2018 05:19 AM by deepakpanchal10
Jun 06, 2018 07:31 PM|tippet|LINK
I have one user that gets an 401 2 5 0 error if they try to access the site using the Loadbalancer (F5)
but if they try the each node directly they get in 200.0.0.
what to check?
Jun 06, 2018 08:03 PM|lextm|LINK
When you asked the question in that way, isn't F5 the one you should check?
Jun 07, 2018 02:35 AM|deepakpanchal10|LINK
This error can be occurs due to the issue with the authentication.
401.2 error indicates that the web server is configured to require certain authentication protocols for communication, but the browser failed to use any of those authentication protocols. The corrective action should be to either configure to require an
authentication protocol acceptable to the client, or use a client that satisfies the server authentication protocol requirements.
Here is how it happens: since NTLM is connection-based authentication, once a client successfully authenticates using NTLM, it often re-uses its end of the connection and simply sends anonymous requests over it. Now, assume
an intervening proxy server pools connections between client and server, is unaware of NTLM, and independently decides to send the client's request over *another* connection in its pool (instead of the already authenticated one) to the server. This causes
the client's anonymous request to be sent to the server over a new, unauthenticated connection, and the server dutifully rejects it with a 401.2 since the server requires Integrated authentication. The 401.2 rejection is totally unexpected by the client since
it thought it was re-using an authenticated connection and did not initiate any re-authentication.
HOWTO: Diagnose 401.x HTTP errors on IIS
Jun 07, 2018 02:30 PM|tippet|LINK
it only happens to one user.
Jun 08, 2018 05:19 AM|deepakpanchal10|LINK
Did you try to check the IIS logs for that user.
Try to check it and try to post it here.
We can get a better idea about issue from the log and it can help us to narrow down the issue.