I have a number of users in another building accessing our central storage as a mapped share, lets say drive Z:. Randomly (mostly just once a day, always at different times) one ore some of them loose the connection to Z:. They still see Z: in explorer but can't access any directory or file. These people are not always the same. These users are using (still) XP and most of them Win7. We checked IP connectivity, DNS resolution, switches and firewall. Nothing to take care of there. Just our NetApp is reporting some error messages.
Thu Mar 27 13:56:26 CET [storage-01: ems.engine.inputSuppress:error]: Event 'cifs.trace.smbSignMismatch3' suppressed 4 times since Wed Mar 26 12:36:17 CET 2014.
Thu Mar 27 13:56:26 CET [storage-01: cifs.trace.smbSignMismatch3:error]: CIFS: Request from client 188.8.131.52 for operation 117 (tconX) was rejected because the client requested enforcement of security signatures (SMB signing) and the signature provided by the client did not match the value calculated by the filer.
We are running SMBv2 at NetApp.
There is another error message, where I'm not sure if it has something to do with my problem.
Thu Mar 27 09:33:41 CET [storage-01: auth.trace.authenticateUser.loginTraceIP:info]: AUTH: Login attempt by user pc08$ of domain DOMAIN from client machine 184.108.40.206 (PC08).
Thu Mar 27 09:36:17 CET [storage-01: auth.trace.authenticateUser.loginRejected:info]: AUTH: Login attempt by user rejected by the domain controller with error 0xc0000064: DC indicates user is not from a trusted domain.
Here I'm not sure if this message belongs to the one before. There is a gap of nearly 3 minutes.
Is there anybody out there who had solved such a problem in the past? Thanks for any hints.