Upgrading couchbase 5.0.1 to 6.0.2 errors out

couchbase uprade error:

any suggestions or ideas? windows 2012 server

i was able to get it loaded on a laptop but I cannot join an existing cluster

Attention: Failed to reach erlang port mapper. Could not connect to “releasetest1” on port “4369”. This could be due to an incorrect host/port combination or a firewall in place between the servers.

did the port nbr change from 5.0.1? The cluster I am trying to join is 5.0.1

No, the port number hasn’t changed. Chances are it’s something in the middle blocking the communications.