Pull DP Content Distribution is failing

Dear All,

We are currently running on SCCM R2 SP1 CU1

We had an issue with Pull DP and content distribution is failing.When we look at distmgr log in source DP, we find below errors 

CWmi::Connect() failed to connect to \\FQDNName of DP\root\CIMv2. Error = 0x800706BA
ERROR DPConnection::ConnectWMI() - Failed to connect to  FQDN(DP). error = 0x800706ba
Failed to find a valid drive on the distribution point ["Display=\\FQDN\"]MSWNET:["SMS_SITE=XXX"]\\FQDN\
Failed to get usable drives for DP

1. Able to connect the remote pull dp from source DP by using wbemtest without any error from source DP

2. Restarted services and Rebooted Pull DP Server but no luck

3. Firewall turned off on both servers (Source DP and Pull DP)

Any thoughts ??

Thanks in advance..