This webpage has a redirect loop


My website main page faced the following problem for my multisite buddpress for past 2 weeks and I couldn't get it solved:

"This webpage has a redirect loop


The webpage at http:// / has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer."

It was running ok until recently. I'm not sure whether the recent updates are the causes. Can you help me out to check my setting?
I can grant the support access.