X connection to localhost:10.0 broken errors in X11Fowarded SSH session

Question & Answer

Question

Why does this error occur when I invoke xclock in an SSH session?

"X connection to localhost:10.0 broken (explicit kill or server shutdown)"

Answer

The error message indicates there is no Xserver available to display the X11 client.

An Xserver must be running on the remote system so SSH can forward the X11 packets.
You must enable X11 forwarding in your SSH client and the AIX SSHD server.

For example:

1)  PuTTY Client: Putty configuration ->

 X11--> X11 Forwarding

  -->Enable X11 Forwarding is enabled

  -->X Display Location value

  -->Remote Authentication Protocol

  Tunnels--> Describe any settings in these fields

2) AIX sshd server process: The following is configured:

/etc/ssh/sshd_config : X11Forwarding yes

Note, you will need to stop and restart sshd to load any changes.

# stoprc -s sshd

# startsrc -s sshd

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SWG10","label":"AIX"},"Component":"X11,SSH","Platform":[{"code":"PF002","label":"AIX"}],"Version":"All Versions","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]

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Document Information

More support for:
AIX

Software version:
All Versions

Operating system(s):
AIX

Document number:
670385

Modified date:
14 November 2019

UID

isg3T1011702

IBM Support

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