[WSL2] Encountered issues on OpenSSH at Ubuntu 20.04 LTS #5244

CamberLoid · 2020-05-21T08:25:16Z

Your Windows build number: (Type ver at a Windows Command Prompt)

19624

What you're doing and what's happening: (Copy&paste the full set of specific command-line steps necessary to reproduce the behavior, and their output. Include screen shots if that helps demonstrate the problem.)

At local WSL2 Ubuntu 20.04 LTS instance

# camber @ Camber-Laptop in ~ [15:49:22]
$ ssh -vvv [email protected]
OpenSSH_8.2p1 Ubuntu-4, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolving "hikari.camber.moe" port 22
debug2: ssh_connect_direct
debug1: Connecting to hikari.camber.moe [101.132.134.54] port 22.
debug1: Connection established.
debug1: identity file /home/camber/.ssh/id_rsa type 0
debug1: identity file /home/camber/.ssh/id_rsa-cert type -1
debug1: identity file /home/camber/.ssh/id_dsa type -1
debug1: identity file /home/camber/.ssh/id_dsa-cert type -1
debug1: identity file /home/camber/.ssh/id_ecdsa type -1
debug1: identity file /home/camber/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/camber/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/camber/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/camber/.ssh/id_ed25519 type -1
debug1: identity file /home/camber/.ssh/id_ed25519-cert type -1
debug1: identity file /home/camber/.ssh/id_ed25519_sk type -1
debug1: identity file /home/camber/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/camber/.ssh/id_xmss type -1
debug1: identity file /home/camber/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4
debug1: match: OpenSSH_8.2p1 Ubuntu-4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to hikari.camber.moe:22 as 'root'
debug3: hostkeys_foreach: reading file "/home/camber/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/camber/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from hikari.camber.moe
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by 101.132.134.54 port 22

At remote Ubuntu 20.04 LTS (journalctl -e --unit=ssh.service)

sshd[7477]: error: kex_input_kexinit: discard proposal: string is too large [preauth]
sshd[7477]: ssh_dispatch_run_fatal: Connection from [MyIP] port 27510: string is too large [preauth]

What's wrong / what should be happening instead:

Referring to #4208 , which is closed for a long time:

in wsl2 when I use ssh to login a remote server, the connection closed immediately

I encountered the exactly same issue.
It's weird because I don't have the issue on my other WSL2 instance, like debian, and neither does my friend's. As the previous issue is closed for a long time, and even i got my workaround, I think I should open this new issue with some detailed information to figure what's wrong.

Strace of the failing command, if applicable: (If some_command is failing, then run strace -o some_command.strace -f some_command some_args, and link the contents of some_command.strace in a gist here).

~~I tried, but by running strace -o ssh.strace -f ssh -vvv [email protected] it works without any errors, which is so weird.~~ See #5244 (comment)

The text was updated successfully, but these errors were encountered:

sixbitproxywax · 2020-05-28T01:48:22Z

Just to add another data point, ssh works for:

Ubuntu 18.04 (WSL 1 & 2)
SuSe Linux (WSL 1 & 2)
Debian (WSL 1 & 2)
Ubuntu 20.04 (WSL 1 only)

At least in my particular case.

I also attempted to do a distribution upgrade from 18.04 to 20.04 using WSL2, and this also failed to work.

sixbitproxywax · 2020-05-28T02:21:31Z

And since @CamberLoid couldn't get a trace, perhaps mine will work as a substitute (our debug output seems similar enough to assume we might be having the same issue):

Here's the gist

danztensai · 2020-06-12T14:04:45Z

Just to add another data point, ssh works for:

Ubuntu 18.04 (WSL 1 & 2)

SuSe Linux (WSL 1 & 2)

Debian (WSL 1 & 2)

Ubuntu 20.04 (WSL 1 only)

At least in my particular case.

I also attempted to do a distribution upgrade from 18.04 to 20.04 using WSL2, and this also failed to work.

for my case it wont work on ubuntu 18.04(WSL 1 & 2) even Ubuntu 20.04(WSL 1& 2). cant do any SSH connection,


`danz@DESKTOP-HTRGUM3:~$ ssh -vv [email protected]
OpenSSH_8.2p1 Ubuntu-4, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolving "sdf.org" port 22
debug2: ssh_connect_direct
debug1: Connecting to sdf.org [205.166.94.16] port 22.
debug1: Connection established.
debug1: identity file /home/danz/.ssh/id_rsa type -1
debug1: identity file /home/danz/.ssh/id_rsa-cert type -1
debug1: identity file /home/danz/.ssh/id_dsa type -1
debug1: identity file /home/danz/.ssh/id_dsa-cert type -1
debug1: identity file /home/danz/.ssh/id_ecdsa type -1
debug1: identity file /home/danz/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/danz/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/danz/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/danz/.ssh/id_ed25519 type -1
debug1: identity file /home/danz/.ssh/id_ed25519-cert type -1
debug1: identity file /home/danz/.ssh/id_ed25519_sk type -1
debug1: identity file /home/danz/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/danz/.ssh/id_xmss type -1
debug1: identity file /home/danz/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.0
debug1: match: OpenSSH_8.0 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to sdf.org:22 as 'new'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],ssh-ed25519,[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by 205.166.94.16 port 22

rescenic · 2020-06-13T06:28:00Z

https://github.com/rescenic/autossh

sixbitproxywax · 2020-06-16T14:34:56Z

https://github.com/rescenic/autossh

I don't believe this actually addresses the problem. If it does, could you explain how?

rescenic · 2020-06-16T16:04:14Z

It's not WSL fault.
SSH works, if 'dmesg' error doesn't appear at the startup (it means in normal startup).

See your logs: debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Try this solution from ServerFault:
https://serverfault.com/questions/210408/cannot-ssh-debug1-expecting-ssh2-msg-kex-dh-gex-reply
https://www.seei.biz/ssh-fails-to-connect-with-debug1-expecting-ssh2_msg_kex_ecdh_reply/

Ubuntu SSH to Windows:

CamberLoid · 2020-06-18T08:48:21Z

The two address have pointed a possible point.
But I have tried before creating the issue and found it not working, meaning setting MTU might not be a solution.

rescenic · 2020-06-18T13:08:20Z

Try this: https://superuser.com/questions/699530/git-pull-does-nothing-git-push-just-hangs-debug1-expecting-ssh2-msg-kex-ecd
From RHEL:

Resolution
Check MTU on both server and client and change to 1500.

Root Cause
There are some devices with MTU that is below than 2000 between server and client.

Diagnostic Steps
Check server and client's interface MTU.

danztensai · 2020-06-30T10:12:49Z

Hi there I fix this problem by updating my wifi driver , it seems wsl 2 kinda have problem with old driver
I'm using killer Wifi , try to update your wifi driver guys

based on this link
#4253

kevin820606 · 2020-08-21T17:20:08Z

Hi there I fix this problem by updating my wifi driver , it seems wsl 2 kinda have problem with old driver
I'm using killer Wifi , try to update your wifi driver guys

based on this link
#4253

I stuck on this problem for weeks, and your suggest is totally work! Thanks!

therealkenc · 2020-09-06T01:15:15Z

Please collect WSL logs and post the backlink to the feedback item here. Also please identify any third-party networking software that has been installed on Windows.

CamberLoid · 2020-09-26T14:43:46Z

Sorry guys, Camber's here.
I'm feeling appreciated to hear responses from collaborator and same issue from other guys. However my previous device (Xiaomi Mi Gaming Laptop 2018) was broken and not able to use.
As it is out of warranty I'm planning to switch to ROG Zephyrus G15. So that I'm afraid I cannot reproduce anymore.
I will leave the issue open to see if any other fellows can help reproduce and upload the logs. Anyone helping this out will be much appreciated.
Stay safe. Camber out.

therealkenc · 2020-09-26T21:34:07Z

Thanks for the follow-up Chamber, it is very appreciated. Let's call this spiritually /dupe #4253. Some drivers do not seem to handle mismatched MTUs well. Or, at least that is a plausible working theory.

Anyone still seeing the OP fail "error: kex_input_kexinit: discard proposal: string is too large [preauth]" please submit a new issue following the template, including WSL logs.

ghost · 2020-09-26T21:34:10Z

Hi! We've identified this issue as a duplicate of another one that already exists in this repository. This specific instance is being closed in favor of tracking the concern over on the referenced thread.

Thanks for your report!

CamberLoid mentioned this issue May 21, 2020

[wsl2] can't use ssh #4208

Closed

therealkenc added the question label May 21, 2020

therealkenc added network and removed question labels Sep 6, 2020

therealkenc closed this as completed Sep 26, 2020

ghost added the duplicate label Sep 26, 2020

Vulp-OS mentioned this issue Apr 8, 2021

Github cloning error in wsl2 (driver MTU) #4253

Closed

github-actions bot mentioned this issue Nov 5, 2024

ssh blocked when git fetch #12240

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[WSL2] Encountered issues on OpenSSH at Ubuntu 20.04 LTS #5244

[WSL2] Encountered issues on OpenSSH at Ubuntu 20.04 LTS #5244

CamberLoid commented May 21, 2020 •

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sixbitproxywax commented May 28, 2020 •

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sixbitproxywax commented May 28, 2020

danztensai commented Jun 12, 2020

rescenic commented Jun 13, 2020

sixbitproxywax commented Jun 16, 2020

rescenic commented Jun 16, 2020

CamberLoid commented Jun 18, 2020

rescenic commented Jun 18, 2020 •

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danztensai commented Jun 30, 2020 •

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kevin820606 commented Aug 21, 2020

therealkenc commented Sep 6, 2020

CamberLoid commented Sep 26, 2020

therealkenc commented Sep 26, 2020

ghost commented Sep 26, 2020

[WSL2] Encountered issues on OpenSSH at Ubuntu 20.04 LTS #5244

[WSL2] Encountered issues on OpenSSH at Ubuntu 20.04 LTS #5244

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CamberLoid commented May 21, 2020 • edited Loading

sixbitproxywax commented May 28, 2020 • edited Loading

sixbitproxywax commented May 28, 2020

danztensai commented Jun 12, 2020

rescenic commented Jun 13, 2020

sixbitproxywax commented Jun 16, 2020

rescenic commented Jun 16, 2020

CamberLoid commented Jun 18, 2020

rescenic commented Jun 18, 2020 • edited Loading

danztensai commented Jun 30, 2020 • edited Loading

kevin820606 commented Aug 21, 2020

therealkenc commented Sep 6, 2020

CamberLoid commented Sep 26, 2020

therealkenc commented Sep 26, 2020

ghost commented Sep 26, 2020

CamberLoid commented May 21, 2020 •

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sixbitproxywax commented May 28, 2020 •

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rescenic commented Jun 18, 2020 •

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danztensai commented Jun 30, 2020 •

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