Use this article if:

  • The GearTest detects a firewall issue
  • You are unable to log onto Remo Conference


What is a firewall?

A firewall filters the information coming through the Internet connection into your private network or computer system. Remo requires access to specific ports in your firewall. Ports in your computer's firewall control determine whether or not a program can access or be accessed by your computer


This flow diagram shows the general approach to troubleshooting your firewall:


STEP 1: If you are using a Virtual Private Network (VPN), please refer to this article specifically about Using VPNs to Access Remo. For everyone else, please take these steps troubleshoot your firewall:


STEP 2: For everyone else, follow these steps:


1. If you haven’t done so already, check here to see if your firewall is running correctly


2. If GearTest detects an issue with your firewall, follow these three steps:

  1. Contact your company’s IT department to verify that your firewall meets these minimum requirements:
    • Open TCP port 80, 443, 3433, 5668, 5669, 5866 to 5890, 6080, 6443, 8667, and 9667.
    • Open UDP port 3478 and ports from 1025 to 65535
    • Safelist the following domains: 
      • .tokbox.com
      • .opentok.com
      • .agora.io
  2. Contact your company’s IT department OR proxy provider to verify that your proxy server meets these minimum requirements:
    • Be a transparent proxy
    • Be configured in the browser for HTTPS connections
    • Does not require authentication
  3. If you continue to have problems, ask your IT department if any of these special circumstances may be affecting your firewall and what can be done to address them:
    • Although not every option has been tested, recent versions of Chrome have full support for authentication
    • Pre 58 version supports NTLM authentication protocol
    • Is the Kerberos forwarding proxy setup in place? (The Kerberos authentication protocol is incompatible with Remo)