when some time back a friend had this problem, he tried login like 20 times and always "serv connect ended"
so i loaded his acc, on a gimp laptop with gimp gfx card, same thing "serv connect ended"
then i loaded it on the "monster" having 2xHD7950 and it loaded without any pb. I removed the suit, transformed the sumonner to scion mode
the guy then loaded without any pb
now not everyone has these gfx settings.
so the answer is YES, desactivate suit in your ini files, even if it is client-sided and it works without any pb