Teamviewer Blocked By Firewall May 2026

TeamViewer is currently non-functional due to firewall restrictions. Both incoming and outgoing connections time out.

Windows 10/11, corporate firewall (SonicWall/Cisco/Fortinet), TeamViewer v15+ teamviewer blocked by firewall

I’m trying to use TeamViewer (full version) but it appears to be blocked by our corporate firewall. Inbound and outbound connections are failing, and I’m getting error code [e.g., 2075 / 2077] . corporate firewall (SonicWall/Cisco/Fortinet)