Marc Gravell recently provided this answer to a question on Meta Stack Overflow:
If you try Jeff's link above, and everything reports OK but it still doesn't work, please let me know. In the interim, there is a ghetto login route:
http://{some site}/users/chat-stackexchange-loginfor example: https://stackoverflow.com/users/chat-stackexchange-login
What does ghetto login route mean, here?