SSH Problem

HTB Content Academy
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1

Hello friends,
I am slowly despairing. I’ve been active on HTB Academy for over 6 months and have never had any problems with ssh connecting to the labs. I use my own Attacker machine.

For a few days, however, I can no longer connect to a service on the HTB using ssh. No matter which lab. I always get the answer: Connection closed by HTB_IP port 22. But it works with the HTB Pawn-Virtual-Machine.

I checked the following:

  • VPN connection ok
  • Trace route ok
  • PING ok
  • Disable Firewall
  • new installed ssh service on linux

Please, if anyone has an idea, I would be very grateful.

2

contact the support.

3

I contacted the support, by they said the Problem is by my side. They dont have a Hint to solve that issue

4

Tried reinstalling your VM?

5

I dont use a VM

6

i could try to help. if you want to talk on discord shoot me your discord

7

Does anybody solve this problem ? I have the same issue I could not connect to any of machine.

8

Hello Krp0.

Are you still experiencing this issue?

If so, can you provide some more detail to your scenario?

What troubleshooting have you already performed?

Thank you,

DotDragon

9

Hi DotDragon,

I solved the issue by downloading VPN file but not with UDP connection but with TCP. I have no idea why this was problem with UDP … because all checks passed but when I tried conenction to some machine I saw in logs that connection was established but then after 1-2 minutes it was refused by server themselve.

2 Likes
10

Often times UDP connections are not as stable as TCP. There also may be the possibility of rejection of UDP traffic to the server(doubtful but I still like to propose potential scenarios).

I’m glad you were able to solve it though!

Cheers and happy hunting!

DotDragon

11

Cheers, that solved my connection as well!

12

I had the same problem. If you use ssh -v USER@IP then you can see what ssh does. For me the last message was “expecting SSH2_MSG_KEX_ECDH_REPLY”. I had to change the network interface MTU. For me worked: “sudo ifconfig tun0(Network Interface you want to modify for me tun0) mtu 1200” but for some worked 1400 instead of 1200. Maybe a different number works for you. Hope that helps :grinning: