At Zoom, we are hard at work to provide you with the best 24x7 global support experience during this pandemic. As part of this ongoing commitment, please review our updated Support Guidelines.

Network firewall or proxy server settings for Zoom Follow


If your app stays in a "connecting" mode or has timed out due to "Network error, please try again" or "Can't connect to our service, please check your network connection and try again" issues, it could be related to your network connection, network firewall settings, or web security gateway settings.

Note: Check your network connection by opening a browser and ensure that you can access

This article covers:

Zoom firewall rules

To configure your network firewall, please see the following table. All rules should be applied both inbound and outbound.  

Protocol Ports Source Destination
TCP 80,443 All Zoom clients *
TCP 443, 8801, 8802 All Zoom clients




3478, 3479, 8801 - 8810

All Zoom clients




Firewall rules for Zoom Phone


Protocol Ports Source Destination
TCP 5091 All Zoom clients

TCP 390 (see note) All Zoom clients

UDP 20000-64000 All Zoom Clients


Firewall rules for Zoom website

Protocol Ports Source Destination
TCP 80, 443 All Zoom Clients *


Additional IP ranges

Additional IP ranges to be allowed can also be found in the following lists:

Proxy server

We support https/SSL proxy server via port 443 for Zoom traffic.

Note: This does not apply to the Zoom Phone service. 

Zoom automatically detects your proxy settings. In some instances, you may be prompted to enter the proxy username/password.

Note: We recommend allowing and * from proxy or SSL inspection. 

Firewall rules for  other Zoom services