How to check if UltraVNC's port is open without receiving an error

[panreyes]

I would like to check remotely if UltraVNC Viewer listener port is open without triggering any errors, like this one:

Is there a way to do that?

[RudiDeVos]

If it is for checking is the pc is online and vnc is running you can use the echo port.
From 1.5.0.0 UltraVNC server has a echo udp port on the tcp vnc port.

[panreyes]

That works for winvnc, but not for vncviewer, right? In any case, I would like to avoid having 2 ports forwarded in the router.

I think I can solve it with an option that will just disable throwing the error "End of Stream", and with the "No status" option will be good enough for my case. I'll send a PR if I manage to make it good enough.

[RudiDeVos]

Uups sorry, the viewer generate that popup and require code change to fix

[panreyes]

Solved by PR #199 ! 🥳