Does anybody know why JOSM keep throwing me this error message?
Posted by bhj867 on 27 July 2016 in English.It happens frequently, especially in urban areas. Sometimes It won’t even let me upload any data at all, and I feel like it doesn’t matter what computer I am using.

Discussion
Comment from Luciano on 28 July 2016 at 00:30
This is basically a server performance problem - the current OGF server is up against some scaling issues.
One solution that has helped me a little bit is to change my timeout defaults in JOSM (under Preferences -> Advanced tab) - see screenshot here:
http://opengeofiction.net/wiki/images/2/26/Luciano_Screenshot_JOSM_Timeout_Defaults.png
However, it doesn’t help that much… the main way I deal with this is to zoom in and try to download smaller areas at a time. Basically, if you ask for too many objects at once, the server takes too long and either JOSM, or the server, or your ISP give up.
Another option for large and dense area edits is to do large .osm file conversions from recent backup files. However, that requires reliable recent backups, which are also not happening because of server performance issues.
Comment from bhj867 on 28 July 2016 at 00:32
That makes sense. Thank you for that. I will wait it out.
Comment from BelpheniaProject on 29 July 2016 at 00:19
Maybe it looks like a server performance problem. I will wait it out too.