Problem connecting to some servers using libssh2

Question

0.00/5 (No votes)

See more:

I have an issue in Libssh2 - 1.7.0 and/or OpenSSL 1.1.0.

When connecting through SSH using the compiled API to an old Linux box, everything is as expected.

When trying to connect to a more recent distribution, the connection fails with error: Failure establishing SSH session: -8.

I read that this error is related to the curl/libcurl version on the Linux machines, but I can't upgrade or download the curl version on them.

The same problem is raised with AIX recent versions.

Any help?
Thanks in advance,
Boris.

What I have tried:

When trying to connect to a more recent distribution, the connection fails with error: Failure establishing SSH session: -8.

Posted 30-Aug-16 1:44am

Member 10826484

Updated 30-Aug-16 2:12am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Answer 1 · 2016-08-30T02:12:00

Recent Linux distributions configure SSH servers to be more restrictive by default.

You might change the server SSH configuration (not recommended) or the authentication method used by your application (recommended).

To avoid such troubles the best solution is to use public-key authentication.

There has been also a number of version 2 ciphers disabled in the default config with OpenSSH 6.7 (see Openssh 6.7 disables a number of ciphers / Networking, Server, and Protection / Arch Linux Forums[^]).

There are even more possible reasons like firewalls. To know what is going wrong you should try to connect from a different system using an up-to-date authentication method to ensure that you can connect to the servers and inspect the log files of the servers where the connection fails.