Unable To Establish Connections

Howdy,

Environment:

Postgres 8.2.3
Solaris 10

We were unable to make a remote postgres connection for ~2 hours this
afternoon.  Receiving the following message in the postgres log every
30 seconds:

LOG:  expected password response, got message type 88

Connection limit is 300.  17 active connections at the time.  Bounced
postgres successfully but the above error message was still being
logged.  About 20 minutes later the error message stopped and
connections started to re-establish.

Any ideas?

Thank you,

Sam