Please read and follow article KB 58966 to make logging more detailed.
Furthermore: does the error occur when you manually run Autoupdate task or also when Autoupdate runs on shcedule?
Sorry for not writing earlier, there's been another troubles...
Ok, something that i found out is the following:
VSE 8.7i PL3 on Windows XP Prof SP2/SP3 in a NT4 Domain will do a selfupdate under the following conditions:
- no one is logged in or an administrative account (local admin rights) is logged in
- restricted user (Poweruser) ist logged in and system is controlled by EPO Server
- restricted user is logged in and update was routed via (standard-)gateway from ftp-server
And now, the solution!!
I discovered that the setting 'Use Internet Explorer Proxy Setting' in 'Edit Autoupdate Repository|Proxysettings' is the reason for the failure!!
After setting it to 'Do not use proxy' everything is working fine now.
Maybe the different automatic detections are to much: Internet Explorer uses 'Autodetect Proxy' and in the Automatic Proxy (Java-) Script is also a detection implemented.
In Addition, that this behaviour didn't happens, if an administrative account or only the system account is logged in, is very strange... ;-)