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[Solved] Cant get no ssh connection with switch in linux

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[Solved] Cant get no ssh connection with switch in linux

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.

Gaijin66

2023-05-20 01:38:39 - last edited 2023-06-28 10:44:41

Posts: 2

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Registered: 2023-05-20

[Solved] Cant get no ssh connection with switch in linux

2023-05-20 01:38:39 - last edited 2023-06-28 10:44:41

Tags: #Configuration

Model: T1500G-10PS(TL-SG2210P)

Hardware Version: V2

Firmware Version: 2.0.6 Build 20200805 Rel.57865

Hello everyone,

In Home Assistant i want to make a ssh connection with the switch (I have the docker version of Home Assistant with version 2023.5.3). This is because i want to make a python script to enable or disable PoE on a specific port. Alas I cannot get a connection. i tried to generate a rsa public and private key with 2048 bits with ssh-keygen. The SSH-server on the switch is enabled. I downloaded the public key in the switch. I tried to copy the public key to ~/.ssh/authorized_keys with ssh-copy-id. Both the public key and ~/.ssh/authorized_keys have file permissions of 600. But when using ssh-copy-id i get an error: Unable to negotiate with switch_ip port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1. In ~/.ssh/config i added some algorithms:

Host jetstream
hostname ip_address
KexAlgorithms diffie-hellman-group1-sha1
HostKeyAlgorithms +ssh-dss
Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc,
user admin
PreferredAuthentications publickey
IdentityFile id_rsa

Host *
KexAlgorithms curve25519-sha256...

I get ping replies from the switch in Home Assistant. When I put the line PreferredAuthentications publickey, password in ~/.ssh/config I can connect to the switch. It is asking for a password, but that is not what I want. What am I missing? Will someone please help me?

1 Accepted Solution

Gaijin66

LV1

2023-06-28 10:38:29 - last edited 2023-06-28 10:44:41

Posts: 2

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Registered: 2023-05-20

Re:Cant get no ssh connection with switch in linux-Solution

2023-06-28 10:38:29 - last edited 2023-06-28 10:44:41

@Tedd404 Thank you for your reply and thinking with me.

I found out What the issue here is. Linux uses OpenSSH, which has a different format than Putty. You have to convert the putty private key in the following way:

Do the following in linux:

- Install putty tools

- Generate private/public key pair with:

puttygen -t rsa -b 2048 -o pp_id_rsa.ppk

- Convert to OpenSSH format:

puttygen pp_id_rsa.ppk -O public-openssh -o id_rsa.pub

- Extract public key:

puttygen pp_id_rsa.ppk -O public -o pp_id_rsa.pub

- Extract private key:

puttygen pp_id_rsa.ppk -O private-openssh -o id_rsa

Import pp_id_rsa.pub to SSH server

Copy id_rsa to ~/.ssh and chmod 600 ~/.ssh/id_rsa

Now I can access the switch with SSH without password.

Recommended Solution

3 Reply

Tedd404

LV4

2023-06-28 09:17:39

Posts: 584

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Registered: 2022-01-05

Re:Cant get no ssh connection with switch in linux

2023-06-28 09:17:39

@Gaijin66

suggest you check with your windows and see if ssh is working. does not seem to be a problem with the switch so far.

nothing to do with the docker/HA. you should check if ssh is available on the switch. no need to tweak your certificate and stuff.

ScReW yOu gUyS. I aM GOinG hoMe. —————————————————————— For heaven's sake, can you write and describe your issue based on plain fact, common logic and a methodologic approach? Appreciate it.

Gaijin66

LV1

2023-06-28 10:38:29 - last edited 2023-06-28 10:44:41

Posts: 2

Helpful: 0

Solutions: 1

Stories: 0

Registered: 2023-05-20

Re:Cant get no ssh connection with switch in linux-Solution

2023-06-28 10:38:29 - last edited 2023-06-28 10:44:41

@Tedd404 Thank you for your reply and thinking with me.

I found out What the issue here is. Linux uses OpenSSH, which has a different format than Putty. You have to convert the putty private key in the following way:

Do the following in linux:

- Install putty tools

- Generate private/public key pair with:

puttygen -t rsa -b 2048 -o pp_id_rsa.ppk

- Convert to OpenSSH format:

puttygen pp_id_rsa.ppk -O public-openssh -o id_rsa.pub

- Extract public key:

puttygen pp_id_rsa.ppk -O public -o pp_id_rsa.pub

- Extract private key:

puttygen pp_id_rsa.ppk -O private-openssh -o id_rsa

Import pp_id_rsa.pub to SSH server

Copy id_rsa to ~/.ssh and chmod 600 ~/.ssh/id_rsa

Now I can access the switch with SSH without password.

[Solved] Cant get no ssh connection with switch in linux

[Solved] Cant get no ssh connection with switch in linux

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