Linden Lab Official:When I log into Second Life, it gets to "Waiting for Region Handshake" and stops.
This article is part of the Extended Second Life Knowledge Base that includes advanced and specialized information. This information was originally provided by Linden Lab, but is not actively maintained nor guaranteed to be accurate. Linden Lab does not certify nor assume any responsibility for this information.
See the official Second Life Knowledge Base for the most current information.
The login state "Waiting for Region Handshake" is reached when the Second Life client sends its first UDP packet to the server and waits for an acknowledgement. If no acknowledgement is received, the login process stops here.
The usual cause of this error is a firewall blocking UDP packets. Consult the following articles for more information on firewall configuration: