ok now i understand you a little better, it sounds like when you loose the connection, you leave behind a ghost connection, then after awhile that connection times out and you can login again. but before it does timeout you can't because the server only allows one connection per IP, so because the ghost connect is still in effect, thats why u recieve that 530 error.......
now there could be many reasons why you loose the connection, but for a first remedy, trying using "noop during transfer" and see that helps you...
and one last thing, a 421 error is when the server has the max allowed users connected, so until a free slot is free by someone else disconnecting, you will not be able to login
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