I suppose you get this message most probably due to a firewall. Try whether you can connect with telnet to the particular MySQL port. If this fails as well you have a network issue - again probably a firewall. Otherwise check your PHP configuration, maybe you havent specified the right port.
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Check to make sure that the server you're trying to access [B]from[B] is allowed to connect to the remote server. Since you're not trying to connect to localhost (as evidenced in the error message), you're most likely having connection issues between a and b
-- make sure that the server you're trying to access from is allowed
-- make sure the remote server is accepting connections
-- make sure the remote server hasn't blocked out the incoming server
-- make sure the USER you're trying to connect as has not maxed out connections
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