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http://issues.apache.org/bugzilla/show_bug.cgi?id=42285

           Summary: mod_authnz_ldap reports [Can't contact LDAP server]
           Product: Apache httpd-2
           Version: 2.2.4
          Platform: Sun
        OS/Version: Solaris
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Other Modules
        AssignedTo: [email protected]
        ReportedBy: [EMAIL PROTECTED]


Bug has been reproduced in Apache 2.2.3 and 2.2.4. When we try to authenticate a
user against a Windows 2003 LDAP server, we occasionally get an Internal Server
500, and the error_log shows an entry like this:

[Sat Apr 28 15:42:02 2007] [warn] [client 10.0.15.12] [13775] auth_ldap
authenticate: user covenant authentication failed; URI /em/gs
[ldap_search_ext_s() for user failed][Can't contact LDAP server]

Restarting Apache makes this error go away, or even opening up the .htaccess
file and resaving it with vi (making no modifications) will make it go away.
Also, when the user click reload within their web browser, it will usually go
away after two or three reloads.

I've tried using both anonymous binds and authenticated binds and multiple ldap
servers, and all ultimately exhibit the same 500 Internal Server Error symptoms.
The more users using the website, the more frequently this error occurs. I was
initially thinking it was related to Apache bug 40878, but the changes proposed
in it were committed to version 2.2.4, and I still have the same problems.

It seems to occur when different users authenticate to the given resource--for
example if user tracy authenticates successfully and then user john comes next,
user john will get the "500 internal server error" after being prompted for
authentication. After the reloading, the page will come up without being
reprompted for authentication.

This is running on Solaris 10, on the Sparc platform.

mod_authnz_ldap internal server 500 ldap_search_ext_s ldap

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