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Volet

a) Check your home quota with the command:
        quota
    You will, for example, get something like this:
    
    Filesystem | blocks      quota     limit        grace       |       files   quota   limit   grace
   /dev/mapper/cachedev2
                           526388* 500000  550000   9days    4161       0       0       4161       0          0
    
    This means:
        - currently you are using 526388 kB. The '*' indicates you are over your quota
        - your quota is 500000 kB
        - for some time you can use up to 550000 kB. This time is expired in '9days'.


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Volet

c) (Re)move files and directories
       1. Remove whatever you do not need anymore. This is a form of infinite compression.
       2. Put whatever does not need to be in your home under your data space.

If you want to keep large files under your home because you would like them to get backed up, also checkout our big "Data backup":

      Data backup


Cannot open window

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/ Error: Can't open display: localhost:...

If you cannot open windows on the servers or get the following error message:

    "Error: Can't open display: localhost:..."

 A simple way to check if your display forwarding is okay. A simple way to do this is to execute the command:
        xclock
 If this opens a little window with a clock your setup is good.
 If If you do not get the little clock window check the following:

 a) When using ssh make sure you used it either with the ' -Y ' key (plus -C for better compression)!
        ssh -YC ...

 b) Check your home quota with (see "Disk quota exceeded in your home" above for more info):
        quota
    If you are over quota in your home you cannot open any windows. To reduce the data in your home check point "Disk quota exceeded in your home" above.

c) MacOS and Windows users

MacOS users:

If you are not using the UNIX side of you Mac make sure you have a "good" version of XQuartz installed. To test if you have a good version check if the command:
     xclock
works directly on you Mac (before connecting to any of our servers). If not you probably need to install a newer version of XQuartz.

Windows users:

If you are not using WSL use it. You can follow this installation guide: Install WSL
If you are using WSL check if the command:
     xclock
works directly in your WSL (before connecting to any of our servers). If not have another look at the installation guide in case you missed something.

Stack overflow

Error message:

  "stack overflow: thread 0, max 10228KB, used 1147KB, request 37324944B"

=> unlimit your stack by setting:

  ulimit -s unlimited

X11 connection rejected because of wrong authentication

Error message:

    "X11 connection rejected because of wrong authentication."

You might be over your quota in your HOME.

Check with:       quota -v

Error: Can't open display: localhost:...

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