Synology DSM7.0.1 not connecting to Tailscale

SUPPORT QUESTIONS
4

I have exactly the same problem as JohnH
I run DSM 7.1.1-42962 Update 5 on a Synology nas 1618+

  1. I uninstalled tailscale from .

  2. Reinstalled it, but trying to login, it goes nowhere.

  3. I removed the nas from the tailscale machine interface and did the 1 & 2 steps again but nothing improved.

  4. I checked the nas firewall, and found nothing special.

  5. I Suspected a problem with the router but having a 2nd synology nas, I have been able to install Tailscale and had not problem to login.

Anybody having an advice to solve that problem (same DSM version and nas model : 1618+) ?

Thanks a million.