Problem: Connections to fileshares(smb) on windows 2012 r2 server are suddenly not possible. This server is also a AD DS server and also GPO`s can`t be retrieved by other clients (example w2008 r2 RDS servers).
Rebooting the server will solve it. No 3rd party software on the server.
Seems no relationship with IO intensity. Events are logged outside of the normal working hours and outside of the backup window.
EventId: 30809 - SMBclient is logged on the windows 2012 r2 server.
A request timed out because there was no response from the server.
Server name: \DOM001
Session ID:0x0
Tree ID:0x0
Message ID:0x0
Command: Negotiate
Guidance:
The server is responding over TCP but not over SMB. Ensure the Server service is running and responsive, and the disks do not have high per-IO latency, which makes the disks appear unresponsive to SMB. Also, ensure the server is responsive overall and not paused;
for instance, make sure you can log on to it.