A few days ago I set up Rustdesk. I set up a local server in Container Manager (docker) on a Synology NAS. 4 Local computers and 1 remote computer have no issue connecting to the server and each other. However, a single local PC refuses.
Attempting to connect to the server via DDNS doesn't work, nor does using it's IP address.
There's some VLANs on the network but I don't believe they're the issue and I've tried all the firewall/port forwarding rules I can think of. However, I may well be wrong, but I don't think this is a firewall/router or Synology issue.
I say this because I don't see anything on the router's logs regarding this PC attempting to connect to the NAS, allowing or blocking. I also found that when I connected the problematic PC to my phone's hotspot, everything worked fine, it connected to the server immediately. I get the feeling this is a Windows 11 issue, though I'm really not sure at this point. Event Viewer is showing errors (#7000) but they seem to be about the service not responding.
I've had the PC network settings set to both Public and Private. I've disabled the PC's firewall. I've specifically allowed Rustdesk to go through the PC's and Synology's firewall. It seems everything I do results in Rustdesk saying "Not ready. Please check your connection".
Also worth noting. I have no problem connecting directly to the computer, via Rustdesk, using it's IP address from within the local network. RealVNC has no problem connecting to it from inside or outside the network. I can, from that computer, ping the server's IP address as well as it's DDNS/FQDN address. Also, if I go to the FQDN from a browser, it takes me to the router's log in page (which is what I'd expect). So it does appear to at least be able to get that far.
I've uninstalled and reinstalled it multiple times and while I don't know that that would fix the problem, I did notice that, try as I might, I can't fully uninstall it. Even using Revo Uninstaller and/or going through and manually deleting any Rustdesk files I can find, as soon I as I reinstall it, it's already populated with the same info.
Hopefully this is semi-coherent. I've spent the last few days pulling my hair out trying to get this last PC connected.
Quick update: I set up a Rustdesk Server on an external network (also on a Synology NAS) and the computer had no issue connecting to it.