Gentlemen
The connectivity issue is now resolved. Trouble was with the HANA server alias and its IP address. OLAP connection that I was using previously was configured using the HANA server alias. My machine however is not a network machine, I bring my own machine at work. Thus at my client network side my machine is an external devise (not within the network). My machine thus failed to translate the server alias into an appropriate server IP.
We now have second OLAP connection created, which uses server IP address. And I have no issues connecting to HANA. A brilliant solution by one of our developers in the team.
Thanks guys for following the post and posting your replies.
HT