Yesterday – with one of Citrix Installations I support users reported that Web Interface performance has started degrading. Initially it took longer for initial loading of web page to get to Citrix Logon Page and longer logon times once users supply Login Name and Password and Click Logon at logon page. After a little while it changed to following message once user provides credentials and click logon.
The Web site is experiencing technical difficulties. We apologize for any inconvenience.
The internal error may only be temporary. Try reconnecting and, if the problem persists, contact your system administrator.
After reviewing eventlogs further on the server – I found following two errors back to back in Application Eventlog.
Source: Citrix Web Interface
Event ID: 0
Category: None
TYPE:Error
Site path: c:\inetpub\wwwroot\Citrix\XenApp.
A critical server error has occurred: System.Web.HttpException: Request timed out. [Log ID: 1e3ef1bb]
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Source: ASP.NET 2.0.50727.0
Event ID: 1309
Category: Web Event
TYPE:WARNING
Event code: 3001
Event message: The request has been aborted.
Event time: 6/6/2009 7:10:41 AM
Event time (UTC): 6/6/2009 12:10:41 PM
Event ID: f3cd069ff8ae4acfbfce2275c7763250
Event sequence: 14
Event occurrence: 1
Event detail code: 0
Application information:
Application domain: /LM/W3SVC/1/ROOT/Citrix/XenApp-1-128887636984531250
Trust level: Full
Application Virtual Path: /Citrix/XenApp
Application Path: c:\inetpub\wwwroot\Citrix\XenApp\
Machine name: WEBINTERFACE SERVER
Process information:
Process ID: 9536
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE
Exception information:
Exception type: HttpException
Exception message: Request timed out.
Request information:
Request URL: http://dom.domain.com/Citrix/XenApp/auth/login.aspx
Request path: /Citrix/XenApp/auth/login.aspx
User host address: XXX.XXX.XXX.XXX
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE
Thread information:
Thread ID: 5
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace:
Custom event details:
For more information, see Help and Support Center at MS etc. etc.
I reset IIS few times and performance will improve for first login and after that it will be back to previous state with same errros in the eventlog. I uninstalled and recreated website with same results but no luck. I repaired Citrix Web Interface installation without much luck. I also Granted NT AUTHORITY\Network Service write permissions on ASP.NET Temp Directories as explained in http://forums.asp.net/p/907937/1009851.aspx . No Luck.
Finally this is what I tried and seems like it did the trick
1. Removed Web Interface by going to Add/Remove Programs –> Remove Citrix Web Interface
2.Verified that Citrix Web Interface Directories are gone from wwwroot – if not manually delete those
3.Uninstalled ASP.Net Version referenced in Eventlog using following switch
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Aspnet_regiis -ua
4.Restarted IIS
5.Installed ASP.Net version I removed in previous steps by using following switch
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -i
6.Installed Citrix Web Interface
7.Created Web Interface
8.Configured Web Interface
9.Recreated Access Methods/Translations
And it did the trick… For web interface is working just fine now..
Also on a side note there was a harddrive failure on that server which rebuilt itself but I was not able to find any connection between webinterface issues and harddrive failure…
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