urgent: migration 7.3 to 7.4 - database does not warm up

hi to all,

I'm running a sapdb 7.3 on WinNt 4.0 system. At the moment I'm doing a migration from 7.3.0.33 to 7.4.0.25. After installing the 7.4 version I executed the additional steps recommended in the docs. The last commands running successfully were
...
14. util_execute migrate database
15. util_release
16. db_offline

when trying '17. db_online' an error occurs: sql_error connection broken...

Any advices are welcome. Please send them to '[email protected]' !

thanks in advance
Heidi Rufer