getting kex_exchange_identification: Connection closed by remote host for priavate gitlab domain, what may the cause?

NavinRaj Pandey

2/6/23, 6:52 AM

I am in Ubuntu 20.04.2 LTS telling this because looks like this version has encryption issues. Today I created a key that's perfectly working on [email protected] but gives kex_exchange_identification: Connection closed by remote host for private GitLab domain here is the .ssh config file

Host gitlab.com
Hostname altssh.gitlab.com
User git
Port 443
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_ed25519

# Private GitLab instance
Host gitlab.ebpearls.com
Hostname gitlab.ebpearls.com
User git
Port 443
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_ed25519

here is the full log

ssh -Tvvv git@gitlab.<mycompanydomain>.com
OpenSSH_8.2p1 Ubuntu-4ubuntu0.3, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /home/nabin/.ssh/config
debug1: /home/nabin/.ssh/config line 9: Applying options for gitlab.ebpearls.com
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 "gitlab.ebpearls.com" port 443
debug2: ssh_connect_direct
debug1: Connecting to gitlab.ebpearls.com [mycompanyip] port 443.
debug1: Connection established.
debug1: identity file /home/nabin/.ssh/id_ed25519 type 3
debug1: identity file /home/nabin/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.3
debug1: kex_exchange_identification: banner line 0: HTTP/1.1 400 Bad Request
debug1: kex_exchange_identification: banner line 1: Server: nginx
debug1: kex_exchange_identification: banner line 2: Date: Wed, 06 Oct 2021 06:50:54 GMT
debug1: kex_exchange_identification: banner line 3: Content-Type: text/html
debug1: kex_exchange_identification: banner line 4: Content-Length: 150
debug1: kex_exchange_identification: banner line 5: Connection: close
debug1: kex_exchange_identification: banner line 6: 
debug1: kex_exchange_identification: banner line 7: <html>
debug1: kex_exchange_identification: banner line 8: <head><title>400 Bad Request</title></head>
debug1: kex_exchange_identification: banner line 9: <body>
debug1: kex_exchange_identification: banner line 10: <center><h1>400 Bad Request</h1></center>
debug1: kex_exchange_identification: banner line 11: <hr><center>nginx</center>
debug1: kex_exchange_identification: banner line 12: </body>
debug1: kex_exchange_identification: banner line 13: </html>
kex_exchange_identification: Connection closed by remot

1443

0 + 0

ssh

gitlab

David

2/6/23, 7:15 AM

looks like this version has encryption issues What is this statement based on? You are also behind in updates you say 20.04.2 and if fully up to date it would be 20.04.3

NavinRaj Pandey

2/6/23, 7:20 AM

it was not supporing / not working for aes-256-cbc-hmac-sha1 I had to use aes-256-cbc ony to make it work in a node project in this version only not in the older ones

muru

2/6/23, 8:55 AM

Did you enable SSH on 443 in your private Gitlab?

Score:0

Ubuntu

NavinRaj Pandey

2/7/23, 4:18 AM

Thats because private gitlab repo doesn't allow ssh from 443 and ISP doesn't allow port 22 for ssh. For those private repo which allow 443 this solution will work. I should be looking for some Jump server sloution where I can use the middle jump server's port 443 then ssh to port 22 of targeted server from there.

0 + 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: getting kex_exchange_identification: Connection closed by remote host for priavate gitlab domain, what may the cause?

TH: รับ kex_exchange_identification: การเชื่อมต่อถูกปิดโดยโฮสต์ระยะไกลสำหรับโดเมน gitlab ส่วนตัว สาเหตุอาจมาจากอะไร

RO: obtinerea de kex_exchange_identification: conexiune închisă de gazda la distanță pentru domeniul priavate gitlab, care ar putea cauza?

RU: получение kex_exchange_identification: соединение закрыто удаленным хостом для частного домена gitlab, в чем может быть причина?

VI: nhận kex_exchange_identification: Máy chủ từ xa đã đóng kết nối cho miền gitlab riêng, nguyên nhân có thể là gì?

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