How do I check if another program is using the same port as UltraVNC?
- Datto RMM
Datto RMM installs and uses UltraVNC (UVNC) when using the VNC functionality within the agent browser. If another version of VNC is installed on a device, whichever VNC version starts up first will use and deny any other VNC access to the required port (port 5900). To check:
1. On the affected machine, click the Windows icon and type cmd to open the command prompt.
2. Type the following command:
@for /f "tokens=5" in ('netstat -nao | find ^":5900"') do @tasklist /FI "PID eq %v"
3. If the output is anything other than
WINVNC.EXE, UVNC is not accessing the required port. There is likely a conflicting version of VNC installed. Contact Datto RMM Support for assistance.