Windows Server 2008/R2 uses Server Message Block 2 (SMB2) protocol as an application-layer network protocol. It is mainly used to provide shared access to files and folders on the network.
When a Server Agent is installed on a server which is using SMB2 protocol, the Server Agent Software sets the SMB2 registry key under HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters to 0 which results in not allowing users to see the shares on the file server using the short names anymore.
The only way to access the shares is to use the full name or the IP address to access the shares like \\servername\Share or \\IP\Share.
Resolution
To resolve the issue of not seeing the shares like before or to use the full name instead of short names, the Admin should set the SMB2 registry key back to 1 after installing the Server Agent software.
After the Server Agent Software is installed and before the reboot, ensure the SMB2 registry at under HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters is set to 1.
If the SMB2 registry key does not exist, go ahead and create the DWORD value registry key with SMB2 for the name and set the value to 1.
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