Couchbase community 5.1.1 server not starting

Hi,

I have installed a couchbase-server-community-5.1.1 server on centos6.
Installation was successful, but unable to see the webpage on 8091 port.
I see this error

Failed to connect to 127.0.0.1 port 80: Connection refused

Looks like the server is not starting or starting but crashing immediately.
I have collected info using “cbcollect_info” tool and have uploaded here (https://drive.google.com/file/d/1oYgCg5NBFg5fGAvIn48IIeou8CiTMObN/view?usp=drivesdk)
or (https://www.dropbox.com/s/oeak2826qxiaxm6/cb.zip?dl=0)

Please help in resolving this.
Thanks in advance.

Port 80 would be the wrong port though. Port 8091.

Thanks @ingenthr.

Restart of the host helped resolve the issue.