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: youtrack.jetbrains.com/issue/WI-25360 — LazyOne
– LazyOne, Commented Feb 19, 2015 at 22:24
Also related (how it can be fixed from server side): stackoverflow.com/questions/26424621/… — LazyOne
– LazyOne, Commented Feb 19, 2015 at 22:29
Try Tools | Deployment | Configuration | Advanced settings -> Always use LIST command, might be helpful. — Kootli
– Kootli, Commented Feb 20, 2015 at 10:43

rjaros · Accepted Answer · 2015-02-24 22:39:32Z

37

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

KexAlgorithms [email protected],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, 2015 at 22:39

rjaros

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6 Comments

Rob Over a year ago

I had the same problem after creating a new vagrant box, and can confirm this works for me.

Guillaume Fache Over a year ago

Actualy KexAlgorithms diffie-hellman-group1-sha1 is enough (for me at least)

Kyu_ Over a year ago

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...

muhammedv Over a year ago

Worked with Debian 8 openssh/sftp-server, thank you.

Cyberlurk Over a year ago

This worked for me too. What does the line "do/mean"?

|

C. Harley · Accepted Answer · 2016-11-06 03:53:36Z

8

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.

answered Nov 6, 2016 at 3:53

C. Harley

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Comments

wasikuss · Accepted Answer · 2015-08-09 18:35:35Z

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 9, 2015 at 18:35

answered Aug 9, 2015 at 18:12

wasikuss

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Comments

nMulot · Accepted Answer · 2016-10-29 19:04:42Z

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, 2016 at 19:04

nMulot

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