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I was using X11 forwarding with an earlier 3.x version of SecureCRT, and had no problems displaying X11 clients on my PC-based X server; now I'm using SecureCRT 3.3 and I am getting a warning in my session windows on the remote server when I try to start my X11 clients.

Between 3.2 and 3.3, a significant change was made in how X11 MIT-MAGIC-COOKIEs are checked by SecureCRT when an X client connection is requested over a forwarded X11 connection.

In SecureCRT 3.3, the mechanism for checking MIT-MAGIC-COOKIEs was changed.

On the SSH server, if you type:

% xauth list

at your shell prompt, you should get a list of the valid X11 cookies that the user you are logged in as on the remote server. In the list, you should see lines of the form:

sshserver.com:10 MIT-MAGIC-COOKIE-1 9c15e979c1ba2ed4106142d97ac5e513
sshserver/unix:10 MIT-MAGIC-COOKIE-1 9c15e979c1ba2ed4106142d97ac5e513

The sshserver.com:10 should correspond to the value set for your DISPLAY variable set on the SSH server at logon time

If you do not see a cookie matching this, then in all likelihood xauth is either not configured or not running properly on the remote SSH server.