Trying to join a server that's already fairly populated will often result in getting stuck at "requesting synchronize" and then a disconnection with a SocketException error. Repeated attempts to join after clearing client cache and/or trying a different username will be still resulting in the same error and inability to join the server.
Launcher version: v15
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What server ?
How many players are connected when it happens?
Could you please add a log.txt.x file from one of the failed tries to connect .
if this happens on any server, if using a windows computer, use the command prompt in administrator mode, and flush your dns
resolver cache, i have had to do this several times and it has worked for me
-Rejected-
no further information and a support issue most likely anyway ( and probably solved after so long a time)