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POSSH Command Execution Hangs, although interactive shell functions fine
 

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  1. POSSH Command Execution Hangs, although interactive shell functions fine
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    <p>When I attempt to execute a command on a remote server with ssh, the ssh command hangs after the <code>exec request accepted</code> debug message, and eventually times out.</p> <p>The failing command: <code>ssh -v -v &lt;username&gt;@&lt;server&gt; uptime</code> (also tried <code>echo hello</code> etc.)</p> <pre><code>debug1: Authentication succeeded (publickey). Authenticated to &lt;server&gt; (&lt;ip&gt;:22). debug1: channel 0: new [client-session] debug2: channel 0: send open debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug2: fd 4 setting TCP_NODELAY debug1: Sending environment. debug1: Sending env LANG = en_US.UTF-8 debug2: channel 0: request env confirm 0 debug1: Sending command: uptime debug2: channel 0: request exec confirm 1 debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel 0: rcvd adjust 2097152 debug2: channel_input_status_confirm: type 99 id 0 debug2: exec request accepted on channel 0 </code></pre> <p>And there it hangs, indefinitely.</p> <p>When I ssh without a command into my remote server, however, I get an interactive shell and all is good.</p> <p>Successful Command: <code>ssh -v -v &lt;username&gt;@&lt;server&gt;</code></p> <p>Output:</p> <pre><code>debug1: Authentication succeeded (publickey). Authenticated to &lt;server&gt; (&lt;ip&gt;:22). debug1: channel 0: new [client-session] debug2: channel 0: send open debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug2: fd 4 setting TCP_NODELAY debug2: channel 0: request pty-req confirm 1 debug1: Sending environment. debug1: Sending env LANG = en_US.UTF-8 debug2: channel 0: request env confirm 0 debug2: channel 0: request shell confirm 1 debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel_input_status_confirm: type 99 id 0 debug2: PTY allocation request accepted on channel 0 debug2: channel 0: rcvd adjust 2097152 debug2: channel_input_status_confirm: type 99 id 0 debug2: shell request accepted on channel 0 Welcome! &lt;prompt&gt;% ... </code></pre> <p>Has anyone an idea why an interactive session would be successful but a command execution not?</p> <p>Has been haunting me for months now because I cannot use unison to sync my files any more (it used to work). Any help much appreciated.</p>
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    1. USRobert Muil
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    1. COI don't know the answer to your question, but I have an idea. Maybe there is a misconfiguration in your SSH client or on the SSH server. Try a different client to the same server, and then try the same client to a different server, and let's see which one works.
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    2. COSome similar problems have been previously posted on stackoverflow: http://www.google.com/search?q=ssh+command+execution+hangs
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    3. COIt is not an SSH configuration issue - it fails from different clients. The server configuration is locked for me, but verified by other users. The other problems posted here are not exactly the same, I've looked through them.
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      1. USRobert Muil
 

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