[Zope-dev] Database Authentication Problem

Hi, a have amysterious problem with my database-adapters. The problem is that sometimes all my database-adapters couldn't connect to my database. after a zope-restart everything works fine. I use Zope-2.2.5 Immunix Redhat 6.2 PostgreSQL 7.1.3 ZopeDA's are ZPygreSQL and ZPsycopg. If the error happens then all Database-connections are closed. No error in the stupid-log. The postgres log say's - Password authentication failed for user 'foo' - for every ZopeDA. Could anyone help me ? Is there a bug which is fixed in a later version of Zope ? thanks as