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Intermittent login failures with OWA

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Intermittent login failures with OWA - 27.Jul.2009 4:38:03 PM

notion

Posts: 1
Joined: 27.Jul.2009
Status: offline

Each day, a small percentage of user logon attempts with Outlook Web Access fail even though the user provides the correct password. The user is presented with an error that the user name or password is invalid. If they re-enter their user name and password several times it either eventually logs in or their account is locked out. Sometimes closing and restarting Internet Explorer lets the user log in successfully.

We are running Exchange 2007 SP1 (with rollup 8) on a Windows 2008 Enterprise Server with SP2. OWA is configured to use forms based authentication with the user name only. All user accounts are in the same domain - the same domain specified as the logon domain for the OWA website authentication. Clients are primarily a mix of Windows XP SP2 and SP3.

Here's an example of a failure from the exchange server's security log:

An account failed to log on.

Subject:
   Security ID:       SYSTEM
   Account Name:       EXCHANGESERVER$
   Account Domain:       DOMAIN
   Logon ID:       0x3e7

Logon Type:           8

Account For Which Logon Failed:
   Security ID:       NULL SID
   Account Name:       AUser
   Account Domain:       DOMAIN

Failure Information:
   Failure Reason:       Unknown user name or bad password.
   Status:           0xc000006d
   Sub Status:       0xc0000064

Process Information:
   Caller Process ID:   0x8b4
   Caller Process Name:   C:\Windows\System32\inetsrv\w3wp.exe

Network Information:
   Workstation Name:   EXCHANGESERVER
   Source Network Address:   172.16.50.27
   Source Port:       3031

Detailed Authentication Information:
   Logon Process:       Advapi
   Authentication Package:   Negotiate
   Transited Services:   -
   Package Name (NTLM only):   -
   Key Length:       0

Thanks for your assistance.

Post #: 1

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RE: Intermittent login failures with OWA - 15.Jan.2010 1:17:29 AM

ablankenbiller

Posts: 1
Joined: 15.Jan.2010
Status: offline

I'm having a very similar problem on a SBS 2003 box with Exchange 2003.

Too add to it, some users' Outlook disconnects rougly once a day. They're using RPC over HTTP to access their email.

To fix it, I need navigate to their OWA and attempt to login, using the correct credentials, and it usually fails many times before finally allowing me to login.

Once I'm able to login, Outlook on their local computer magically reconnects.

(in reply to notion)

Post #: 2