I am using X11 over the secure shell with the trusted forwarding flag, i.e.using trusted forwarding with ssh -Y Today I have been receiving the following error:/usr/bin/xauth:  error in locking authority file /home/users/USERNAME/.XauthorityTo actually try to use X11 with an application, I get the errorX11 connection rejected because of wrong authenticationIt's difficult to find exact documentation regarding what is going on here. Any advice?EDIT: For future users: when this happens, it appears either (A) you are out of disk space or (B) the file permissions are wrong. It looks like I had a combination of the two. Issue resolved. 
Error with `ssh -Y`, error in locking authority file
ssh;x11