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c# ssh tunnel with plink

Posted on 2014-11-26
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Last Modified: 2015-02-16
I have a C# web application that runs on Windows Server 2008 r2 and .NET 4. I have an SSH tunnel set up that runs via plink and stays running via AlwaysUp.

This web app was previously running on Win2k Server with .NET 1.1 and the tunnel would stay open as long as the server was running.

However, I've noticed now on the new server the web app can not maintain the connection. If I touch the web.config file the web app can use the connection and all is well. However, after about 2-3 minutes the connection is still alive on the server, but the web app won't connect until I touch the web.config again.

I'm not much of hardware person so I'm hoping maybe there is a setting on the server or within the web app that I am missing or something has changed in .NET idk I'm at a loss.
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Question by:YPU
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Expert Comment

by:David
ID: 40469933
Not my area, yet I wonder why you use plink (for batch-style commands); and at least for the other SSH connections I can set a keepalive parameter in my host's ssh_config.  HTH
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Expert Comment

by:serialband
ID: 40474908
With Openssh, you could supply the "-o ServerAliveInterval=120" when you call the command.  Unfortunately, plink doesn't allow options to be passed through.  You'll have to set it in your config file.

Run the following to add the interval to your account's client configuration file.
echo "ServerAliveInterval 120"  >>  ~/.ssh/ssh_config
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YPU earned 0 total points
ID: 40603754
I solved this issue on my own. I found that I was not properly closing the connection to the mysql database and there were too many connections to the db, causing the db to disallow any new connections. I patched the code and restarted the db and all is well.
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Author Closing Comment

by:YPU
ID: 40611886
Problem solved. Make sure the database you are trying to connect to has available connections.
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