Connection to mail server times out after yum updates CentOS to 5.1

Last night running yum updated CentOS to 5.1

Prior to update mail server was working perfectly. Now connection to mail server times out when attempting to retrieve mail with external mail client or Usermin.

Maillog shows:

Dec 5 09:31:26 server dovecot: imap-login: imap-login: error while loading shared libraries: libsepol.so.1: failed to map segment from shared object: Cannot allocate memory

PAM was updated but I can't locate the problem here.

Status: 
Closed (fixed)