i run a pair of asa5520 firewalls whit a remote access vpn configuration. Client authentication is based on acs4.1 and certificates matching organisation field to a group. every group has a specific dynamic ACL. All pc's are win xp sp2 whit cisco vpn3000 version 4.8.x and windows integrated firewall.
Problem is that some clients sporadically reports a "Remote peer no longer responding" an disconnects. Other clients seems to work fine. No patern in how long time they stay on. the client can connect imidiatly after. The windows event logs shows some masterbrowser selection and timesync errors almost simmultaineuos whit the disconnects