Unable to Add Virtual Machine Name - VMware

This was addressed in a previous post. See if this helps:

This can be an indication that ports are not being released quickly enough to allow another connection on that port. The registry setting TcpTimedWaitDelay can be added to reduce the time a port will stay in this state.

1. Go to Start | Run, type regedit, and click OK
2. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
3. Highlight the Parameters key, right-click and select New | DWORD Value
4. Type the name TcpTimedWaitDelay 
5. Double-click TcpTimedWaitDelay and enter a decimal value of 30

By default, this value is 240 seconds (4 minutes). It is recommended that this be changed to a value between 30-60 (seconds) in decimal, to decrease the wait time before a port becomes available.

Warning: Incorrect use of the Windows registry editor may prevent the operating system from functioning properly. Great care should be taken when making changes to a Windows registry. Registry modifications should only be carried-out by persons experienced in the use of the registry editor application. It is recommended that a complete backup of the registry and workstation be made prior to making any registry changes.

tried setting the same through CLI using following commands it does adds but does not verify the credentails.

/usr/openv/volmgr/bin/tpconfig  -add -virtual_machine abc.fqdn -vm_user_id root -vm_type 2 -password abc123

Have you verified that OS firewall (iptables) is disabled on the Linux backup host?

Maybe check normal NBU comms from master to backup host (bptestbpcd) to ensure that forward and reverse lookup and port connectivity is working fine.

Yes..it has been verified that no iptables is enabled.

Also from Master to backup host things are fine...but from backup host to Master it is not able to telnetn to bpcd etc.