PhpStorm: Algorithm negotiation fail

Question

I've a remote server where I host my projects. And I'm using my PhpStorm locally, so every time I save, it synchronizes automatically with the remote server.

However, I failed to configure PhpStorm to run PHPUnit on the remote server.

Under Configure Remote PHP Interpreter I fill out the right information (Host, User name, and Password).

The error I'm having is "Algorithm negotiation fail" when I validate and "Test SFTP Connection: Connection to 'id address' failed. Connection failed" when I try to specify the path of PHP interpreter.

How do I fix that ?

Please refer to this ticket: https://youtrack.jetbrains.com/issue/WI-25360 — LazyOne, Feb 19 '15 at 22:24
Also related (how it can be fixed from server side): http://stackoverflow.com/questions/26424621/algorithm-negotiation-fail-ssh-in-jenkins — LazyOne, Feb 19 '15 at 22:29
Try Tools | Deployment | Configuration | Advanced settings -> Always use LIST command, might be helpful. — Kootli, Feb 20 '15 at 10:43

score 38 · Accepted Answer · answered Feb 24 '15 at 22:39

38

I had the same problem. I solved this problem by adding

KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

to

/etc/ssh/sshd_config

and after that, I restart sshd

sudo systemctl restart sshd

answered Feb 24 '15 at 22:39

rjaros

495
4
5

I had the same problem after creating a new vagrant box, and can confirm this works for me. – Rob Apr 28 '15 at 09:38
4

Actualy `KexAlgorithms diffie-hellman-group1-sha1` is enough (for me at least) – Guillaume Fache Jun 26 '15 at 15:43
I just tried this solution, I'm not having the algorithm error but ssh is blocked. I always have a "connection refused" when trying to connect with ssh... – Kyu_ Jul 07 '15 at 10:20
Worked with Debian 8 openssh/sftp-server, thank you. – muhammedv Sep 07 '15 at 08:45
This worked for me too. What does the line "do/mean"? – Cyberlurk Sep 25 '15 at 10:38
@Zahrec read https://www.freebsd.org/cgi/man.cgi?query=sshd_config&apropos=0&sektion=5&manpath=Debian+7.7.0&arch=default&format=html – rjaros Oct 21 '15 at 09:13

score 8 · Answer 2 · answered Nov 06 '16 at 03:53

Just upgraded Ubuntu to 16.04 and encountered this issue, the "Algorithm negotiation fail" in PHPStorm 8.0.3.

The problem is with the jsch-0.1.51.jar library. If you overwrite the jsch-0.1.51.jar file with the latest from https://sourceforge.net/projects/jsch/ (currently jsch-0.1.54.jar) and restart, it should be fine. No need to add insecure algorithms to your ssh daemon.

wasikuss · Answer 3 · 2015-08-09T18:35:35.150

2

As Guillaume Fache proposed, minimal configuration for PhpStorm is:

KexAlgorithms diffie-hellman-group1-sha1

but diffie-hellman-group1-sha1 use:

1) 1024 bits modulus - breakable, marked as insecure

2) SHA-1 - breakable, confirmed collision attack possibility

conclusion:

use public/private key pair - more secure and no needs to save or type password

edited Aug 09 '15 at 18:35

answered Aug 09 '15 at 18:12

wasikuss

969
8
13

score 1 · Answer 4 · answered Oct 29 '16 at 19:04

1

edit this file :

sudo /etc/ssh/sshd_config

add this line :

KexAlgorithms diffie-hellman-group1-sha1

and restart :

sudo systemctl restart sshd

It works for me!

answered Oct 29 '16 at 19:04

Biker974

11
1

PhpStorm: Algorithm negotiation fail

4 Answers4