Next Update: Yesterday there wasn't a Client Network Drive Disconnect Error (I thought that I have fixed ist) but Today there are 2 Clients with the Error.
Changes: I have lowered the Weight at the SRV Records from 100 to 25 of the Active Directory Jobs (ldap, kerberos,..) of the physical Domain Controller which is the PDC of the domain, to minimize the DNS / Active Directory Storm of the Clients. I wanted to check if the PDC is overloaded by Clients, and at this day we had no Client disconnect error. At the Evening I made a Recompose Job on all Pools, and today I had 2 Clients Disconnect Errors Again, they had 3 Kernel-General Events in the System-Log.
(https://technet.microsoft.com/en-us/library/cc961719.aspx) >>> SRV Records Weight.
Are they pingable by DNS and IP? >>>> Yes you can ping everything in the domain, IP and DNS, From Client to Server or Server to Client.
did you verify all the hosts have ntp started and is running: >>>> Yes on all ESX Host the Service is running and configured (We changed it to only 1 Physical to have only one Time Server, but this did'nt work)
best regards michael