Are you saying that before the crypto map you could telnet successfully between the routers accross the Internet and after the crypto map that telnet does not work?
If you post interface, crypto map, and access list portions of the config it might help figure what is the problem.
My guess without seeing any details is that the crypto maps do not match between the routers and that one map (access list identifying traffic) does include telnet and the other does not.
HTH
Rick
HTH
Rick