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+====== X over SSH with sudo/su ======
+X over SSH is a nice feature which allow the X traffic to be encrypted in the SSH tunnel.\\
+Executing su / sudo will although break the X traffic and result in a error\\
+X11 connection rejected because of wrong authentication.\\
+X connection to localhost:10.0 broken (explicit kill or server shutdown).
+The problem is that the MIT-MAGIC-COOKIE not will survive sudo/su\\
+Here is a little trick to add the originating users MIT-MAGIC-COOKIE to the end user
+  # ssh -X <username>@<hostname>
+  # xauth list
+Output similar to:
+  <hostname>/unix:<display>  MIT-MAGIC-COOKIE-1  <unique MIT-MAGIC-COOKIE key>
+Copy output from xauth list (whole line), then sudo / su
+As new user:
+  # xauth add <the output of the above xauth list>
+  # export DISPLAY=<hostname>:<display>
+Hostname & DISPLAY variable, which is also seen in the xauth list.\\
+You might skip the EXPORT DISPLAY command if the DISPLAY variable is already configured correct.

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