MSDTC issue, DTCping  showing failures on both source and destination servers

MSDTC issue, DTCping  showing failures on both source and destination servers:

Cluster Environment detected
MSDTC Virtual Name:CLUSMSDTC, IP:X.X.X.X (Mask:255.255.255.0)
++++++++++++++++++++++++++++++++++++++++++++++
     DTCping 1.9 Report for SQL-XXXXX
++++++++++++++++++++++++++++++++++++++++++++++
Firewall Port Settings:
      Port:5000-5100
RPC server is ready
++++++++++++Validating Remote Computer Name++++++++++++
02-20, 13:19:44.864-->Start DTC connection test
Name Resolution:
      Host1-->X.X.X.X-->Host1
02-20, 13:19:49.540-->Start RPC test (Host1-->Host2)
Problem:fail to invoke remote RPC method
Error(0x6BA) at dtcping.cpp @303
-->RPC pinging exception
-->1722(The RPC server is unavailable.)
RPC test failed