I've set up a client to site vpn using Windows XP client which works fine when connecting wirelessly via a Vodafone dongle. I have just installed a new ASA 5510 in a brand new branch office network. When connecting through the ASA from the new network, it tries to verify and then I get a 619 error and cannot connect. I have added a rule to the ouside interface coming in. What do I need to do to let it authenticate?
Can you check if inspect pptp is enabled under the global policy map, although I think that maybe if you were connecting to a pptp server on the outside from the inside, and since you have an outside acl then it should work. Try setting the logging level to debug and check the logs to see if anything weird is happening. In any case give the following link a check.