On a Networked PC when trying to View Workgropu Computers, message "Workgroup is not accessible. you might not have permission to use this network resource. contact the Administrator of the Server to find out if you have access permissions.
The list of Servers for the workgroup is not currently available"

This resource was available until recently
The Company have approx 20 PCs, most in "Workgroup" workgroup, the company uses a NAS storage device & I backup from the NAS onto a Workgroup PC

I can Ping other devices in the Workgroup

If I change the PC I connect to to workgroup "MSHOME" & restart it displays all PCs in MSHOME workgroup but trying to display Entire Network shows all workgroups except "Workgroup", there are 4 different workgroups on the Network

thanks for all Ideas