We have a forest including 3 domains, each domain having a number of domain controllers, file servers, and client pcs. In late February users began experiencing random workstation freezing when trying to access files on mapped network drives. The freezing appears to be off and on, and is cross domain/file server.
Server 2003 R2 SP2 - Virtual
MS Patches up to date as of 3/9/2010
VMWare tools up to date
MS Patches up to date as of 2/23/2010
Various image versions across various HP hardware models
Server actions (all taken without creating or remediating issues)
Verified DNS is resolving properly
SCOM/Event logs are not reporting any NetBios alerts
Was running w/o NetBios over TCP/IP, and now changed
Currently running wireshark and perfmon logging
Perfmon, SCOM, and other performance tools not showing any spike or contention in resources at known times of freezing
VSS Volume Shadow Copy disabled on all servers. Known 2/2010 hotfix deployed to primary data servers before disabling of service w/o luck.
Server is unaccessible when client is freezing up. (e.g. User A freezing while trying to browse drive D:<Server A>. At the same time, user B cannot browse to "\\<ServerA>\. Once User A stops freezing, user A and B can both access the server without a problem.
Switches monitored and no visible issues
Routers monitored and no visible issues
Verified no abnormal network traffic increases
Verified typical offenders (WSUS, SMS/SCCM, Virus Scan) were under control