SSH.NET "Server string is null or empty" exception

Question

I use SSH.NET(2013.4.7 version) library for uploading files to SFTP server. Here is piece of my code:

using (var client = new SftpClient(host, port, username, password))
{
    client.Connect();
    ...
}

I get following error message on Connect() method execution: "System.InvalidOperationException: Server string is null or empty."

I have found small advice regarding this issue here: http://www.ipbalance.com/programming/ms-powershell/1098-powershell-how-to-use-sshnet-library-for-cisco-on-windows-7.html to use 'x.x.x.x' host format instead of x.x.x.x, but it doesn't help me.

Value of host variable is "153.112.49.198". port is 22. It works fine, when I use FileZilla tool with the same host, port, username and password.

Stack trace:

System.InvalidOperationException: Server string is null or empty.
at Renci.SshNet.Session.Connect()
at Renci.SshNet.BaseClient.Connect()
at [here is my method]

Any help will be appreciated.

Can you connect using command-line ssh or PuTTY? What are the other variables? — Jakuje
– Jakuje, Commented Aug 4, 2016 at 17:26
Show us an exception callstack + What version of the library are you using? — Martin Prikryl
– Martin Prikryl, Commented Aug 4, 2016 at 18:55

Yuri Dorokhov · Accepted Answer · 2016-08-05 09:12:57Z

7

Finally, I have solved this problem. There was SFTP server setting “Max number of connections” with value “1” by default, so I was not able to connect, since FileZilla's connection was already created.

answered Aug 5, 2016 at 9:12

Yuri Dorokhov

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