Hi Manish - Couple of questions. Are you in client network when you open workboon in India. ? Also what is the IP address your VM is installed and what is the port you have chosen while installing tableau server. ?
Please tell us the sing-in server address you are using. Port also should be part of sign-in address just fyi.
Manish are you able to login to Tableau Server's web interface? If so, are you using the same URL when signing into Tableau Server in Tableau Desktop?