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KB-4204: Connecting to Ubuntu via SSH results in a "Broken Pipe" error

Centrify DirectControl ,   Centrify Identity Service, Mac Edition ,  

12 April,16 at 11:18 AM

Applies to: Centrify-Enabled OpenSSH on Ubuntu 10

Problem: 

Attempting to SSH into a Ubuntu system with an AD account fails with a "Broken Pipe" error.

Connecting via SSH with a local account (non-AD) works with no issues.


Cause: 

On Ubuntu 10.04, the lib_pthread library is too old.

When attempting to SSH with an AD account, the client remoting in tries do Single-Sign-On, however GSSAPI cannot obtain a mutex through lib_pthread, and so fails. This error event in turn closes the connection with the given error.

(As of time of writing; Ubuntu is already on version 13 with version 10 Desktop already at end-of-life support and Server ending in 2015)


Workaround:

Remove lib_pthread from the SSH configuration:

Edit /etc/centrifydc/ssh/sshd_config, find and edit the following lines:
 
GSSAPIAuthentication yes
GSSAPIKeyExchange yes
GSSAPICleanupCredentials yes

..to:
 
#GSSAPIAuthentication yes
#GSSAPIKeyExchange yes
#GSSAPICleanupCredentials yes

Restart sshd by running:
 
/etc/init.d/centrify-sshd restart

Once the process has restarted, try to SSH into the server again to test the connection.


Resolution:

Since the issue is in an older version of lib_pthread, it is recommended to update to a more recent version of Ubuntu.

Please note that this is not a Centrify issue.

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