First, what version of the SDK are you using? It looks like you're using something before 1.5.0 (based on the text of the error message) -- can you try with 1.5.0?
Basically the logic that's happening here is: - the application calls create channel - the dev appserver gins up a token consisting of a random string plus the application-provided client id - the dev appserver adds this token to a hashmap of token -> clientid - the dev appserver returns the token Later, when the client connects, this happens: - the client makes a post to /_ah/channel/dev? command=connect&channel={{token}} - the dev appserver intercepts this request and looks up the "channel" query param in the hashmap of token -> clientid What seems to be happening in your case is that the dev appserver can't extract the "channel" query param based on the "application key is null" error. All I can think of is that there's something in the token that's preventing the query params from being parsed correctly. As a test, can you try simplifying your client id? (I can't read the whole thing because Groups thinks it's an email address and elides it) -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.