Simplified ssh commands in vampir.md.

doc.zih.tu-dresden.de/docs/software/vampir.md

@@ -33,7 +33,7 @@ For members of TU Dresden the Vampir tool is also available as
 [download](http://tu-dresden.de/die_tu_dresden/zentrale_einrichtungen/zih/forschung/projekte/vampir/vampir_download_tu)
 for installation on your personal computer.
 
-Make sure, that compressed display forwarding (e.g., `ssh -YC taurus.hrsk.tu-dresden.de`) is
+Make sure, that compressed display forwarding (e.g., `ssh -YC taurus`) is
 enabled. Start the GUI by typing
 
 ```console
@@ -142,9 +142,15 @@ marie@login$ vampirserver list
 Open a second console on your local computer and establish an SSH tunnel to the compute node with:
 
 ```console
-marie@local$ ssh -L 30000:taurusi1253:30055 taurus.hrsk.tu-dresden.de
+marie@local$ ssh -L 30000:taurusi1253:30055 taurus
 ```
 
+!!! important "SSH command"
+
+    The previous SSH command requires that you have already set up your [SSH configuration
+    ](../access/ssh_login.md#configuring-default-parameters-for-ssh).
+
+
 Now, the port 30000 on your desktop is connected to the VampirServer port 30055 at the compute node
 `taurusi1253` of the ZIH system. Finally, start your local Vampir client and establish a remote
 connection to `localhost`, port 30000 as described in the manual.