RT-AX88U - 3004.388.8_2 - SSH connection closed after few minutes from reboot

[ardennguyen]

I'm facing issue where dropbear will close the connection and refuse to accept any connection after that, until a reboot.
After a reboot, SSH works fine for a few minutes then close again with no system log alert.

Anyone has same issue?

 

[ColinTaylor]

Make sure you don't have anything on your network that is set to automatically log in via SSH (e.g. home automation device). Also check that you have not enabled SSH access from the WAN (Administration - System).

 

[ardennguyen]

Make sure you don't have anything on your network that is set to automatically log in via SSH (e.g. home automation device). Also check that you have not enabled SSH access from the WAN (Administration - System).

I don't have any device set to log in router's SSH automatically. Also, SSH access is set to "LAN Only", no WAN access.

I found this changelog from dropbear's author's website saying build 2024.84 used on 3004.388.8_2 has some regressions. Link: https://matt.ucc.asn.au/dropbear/CHANGES

Problem is I only noticed this issue today, not sure if it happened before when I upgraded the router firmware.

 

[DJones]

I don't have any device set to log in router's SSH automatically. Also, SSH access is set to "LAN Only", no WAN access.

I found this changelog from dropbear's author's website saying build 2024.84 used on 3004.388.8_2 has some regressions. Link: https://matt.ucc.asn.au/dropbear/CHANGES

Problem is I only noticed this issue today, not sure if it happened before when I upgraded the router firmware.

Might be some useful info here: https://openwrt.org/docs/guide-user/base-system/dropbear

 

[DJones]

Check your ssh client doesn’t also have any inactivity settings.

 

[Ripshod]

It's not your router, it's not the firmware and it's not dropbear (unless your router is somehow infected). What does the system log say when ssh fails? What ssh client are you using? Does sshd ever appear in top/htop? If dropbear gives you time enter "dropbear -V" (without the quotes) to confirm the version.