Connection ArcSDE failed to connect to database

Discussion created by Pi-Hellz on Feb 8, 2011
Latest reply on Mar 7, 2011 by vangelo-esristaff

We are having a lots of connections problem with this error :

Failed to conect to database.
Maximun number of connections to instance exceeded[Connection failed when attempting to connect using a 9.3.1 direct connect driver to a 9.2 geodatabase. Missing suitable direct connection driver for this connection type. Please install the 9.2 direct connection driver. ArcSde Direct Connect driver release = 93004; ArcSde database instance release - 92011; ArcSde low release for instance - 92005]

The problem can happen twice a day and came back two week laters !! It's always random but most of the time it's work.

Is anybody have a solution to fix this error ??