When I log into Second Life, I get to Verifying Protocol Version and stops. What’s wrong?
If you are on a business or university internet connection, you may need to contact your network administrator to verify that you can make non-web connections to the Internet. Specifically, you need to make both UDP and TCP connections, inbound and outbound, on network ports 443 and 12020 to 13050, inclusive. If your network cannot provide the proper connection, you may be unable to connect to Second Life. [source]