Comment 1 for bug 246650

It turned out to be the source of the problem is ssh communication. I had .ssh keys setup to avoid prompting of passwords for ssh. I could have not suspected ssh first, because ssh over my destination machine was just working fine. However I noticed the problem when scp was not working (but ssh was ok!). After I removed my .ssh directory, the problem disappeared.

However, this bug needs to be fixed to give proper error message when ssh communication does not work properly.