[Marco van Herwaarden]

A satellite connection is a very special connection in such a way that downstream (ie from your site to the user) is sent over a satellite link, and the upstream (ie. from user to server) sent by a seperate phone connection. This unless he uses a very rare full-duplex satellite connection.

But it is very likely that his connection is the problem in this case, most likely the upstream timing out for some reasons or never reaching the destination.

But as he is the only user with this problem it is 99.99% sure that the problem is local to him and probably it is not possible to troubleshoot from your end.

Guess this is a case of tough luck.