@baris Yeah noticed it now. Actually, I also setup the nginx configuration following nodebb docs, specially the one for utilising multiple(2) cores for nodebb, but somehow missed the line related to protocol. Thanks a lot again.
@bh4-tech My editing was correct but there was some problem with git on my server. I have fixed the things and now google registered users are having underscore in username instead of dash and can also be followed and mentioned from threads.
@julian The problem is solved and thanks a lot for the support.