You can use the original account name and password to login (SSH/SFTP) the new server by hostname webcloud01.hku.hk. And You can simply type the temporarily domain name “nOriginalDomainName” in the browser to browse.

But for much serious checking, please consider using “local hosts file method”: add the following line to your PC  , during testing 147.8.204.239   OriginalDomainName.hku.hk