close #75
thanks

Hi Reinhard,

I have checked this issue on my machine.

This bug used to exist for quite a while and I ignored it.

Reproducing with old pyhoca-gui versions:

   o generate two rsa/dsa pub+priv keypairs A and B
   o install the pubkey of A on the server
   o test that privkey of A for authentication -> works
   o test privkey B for authentication -> fails with ,,not a valid DSA key''

The error message is raised in Python Paramiko.

With latest pyhoca-gui code the issue has vanished. If you use an  
invalid key (i.e. one that fails to auth with the server), then  
pyhoca-gui falls back to password authentication.

Feel free to reopen this bug, if you experience this differently with  
versions >= 0.2.1.1 of Python X2Go and PyHoca-GUI.

Greets,
Mike

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