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"SAS window: winlogon.exe" error on Citrix server

Posted on 2004-10-18
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Last Modified: 2012-06-27
This is more of a Citrix question, but their support site is not very helpful and I can't find a specific Citrix forum on this site.

When our users log in to our Citrix server (Citrix Metaframe XP Feature Release 3 on Windows 2003) they get the following error:

SAS window: winlogon.exe - Application Error
        The instaruction at "ox..." referenced memory at "0x..". The memory
could not be "written".
        Click OK to terminate the application.

When they click OK, the session closes.  We have applied every hotfix available on Citrix's site.
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Question by:rolfejr
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by:robrandon
ID: 12340081
Do you have PCAnywhere installed on the server?
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Author Comment

by:rolfejr
ID: 12340219
No, and I checked the registry to see if it had been installed ever (it hasn't).  However, we do use a program called NetOp Remote Control, which we use to get access to the console and to remote control other machines.  While it could certainly be part of the problem, it has been installed on the server since before we were having this problem.  This problem has been particularly difficult to track because it will only surface about once a week.  Most of the time it is fine, and a reboot generally fixes it.
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by:robrandon
ID: 12340279
Is it feasible to try removing that software for a week to see if it helps with the problem?  Maybe it only surfaces after the remote control is actually used?

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Author Comment

by:rolfejr
ID: 12340299
This is possible.  I will first remove and reinstall the software. If the problem comes back, then I will just remove the software and leave it off for awhile.
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Author Comment

by:rolfejr
ID: 13122759
We have resolved this issue.  It turned out to be a DNS misconfiguration.  For anyone else who may encounter this, make sure that the DNS servers that your citrix server point to are ALL serving up internal DNS addresses.  Also, make sure your DNS client is enabled.  We had our primary DNS server giving out internal addresses, but the secondary was giving out external addresses, and our DNS client service on the citrix server was disabled.  We removed the secondary DNS server, reenabled the DNS client service, and all was happy.
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