Firewall or Proxy Server Setting Configuration Requirements in Zoom App

The app stays in “Connecting” mode, “Network error. Please try again” or “Unable to connect to service. Please check your network connection and try again. Please try again” error If the error times out, check your network connection, network firewall settings, or web security gateway settings.

Note : Check the network connection to open the browser, Https://Zoom.Us to please make sure that you can access.

The content of this article is as follows.

  • Zoom firewall rules
    • Zoom Phone firewall rules
    • Zoom website firewall rules
    • Firewall rules for certificate validation
    • Additional IP range
  • Proxy server
  • Firewall rules for other Zoom services

Zoom firewall rules

Refer to the following table to configure the network firewall. The following rules should be applied to outbound traffic. Zoom communicates with the destination port it receives when the client connects. The firewall must be configured to allow these return connections.

protocol port sender address
TCP 80、443 All Zoom clients *
TCP 443、8801、8802 All Zoom clients IPv4:


UDP 3478、3479、8801 – 8810 All Zoom clients IPv4:


Zoom Phone firewall rules

Connection type: Zoom Phone

• Outbound port 390 must be open to search the company directory on your desk phone .
• To see the firewall rules for zero-touch provisioning, see the Poly or Yealink support site.

Protocol Ports Source Destination
TCP 5091 All Zoom clients
TCP 390 ( see Note ) All Zoom clients
UDP 20000-64000 All Zoom clients

Zoom website firewall rules

Connection type: Zoom website

protocol port sender address
TCP 80、443 All Zoom clients *

Available web browsers are Google Chrome, Safari, Firefox, Microsoft Edge, and Internet Explorer. Please refer to the Zoom Web Client for the requirements of each browser.


Firewall rules for certificate validation


Starting with Zoom Client 5.5.0 , the following URLs must be whitelisted for certificate validation :

protocol port sauce First
HTTP 80 Zoom client


Additional IP range

The corresponding additional IP range is listed in the following list.


Proxy server

Port 443 via https / SSL supports the proxy server.      Note : This does not apply to the Zoom Phone service.

Zoom will automatically detect your proxy settings. In some cases, you may be prompted for your proxy username/password.

Note: We recommend whitelisting from and proxies or SSL inspection.


Firewall rules for other Zoom services


Conference connector, etc.


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Frequently Asked Questions

Zoom may be blocked by Windows Firewall if the following steps are taken:

Search for Windows Security in the Start menu. You can click it. In the next step, you will need to click on Firewall and network protection. Click on the Allow an application to pass through the firewall option in step three.

Make sure that your firewall is configured correctly
  1. You will find Windows Security under the Start menu if you open the Start menu. …
  2. Next, click on the Firewall and network protection tab.
  3. Allowing an app through the firewall can be done by selecting the checkbox.
  4. Click on Change Settings once the new window has opened.
  5. Then, scroll down to the “Zoom Video Conference” option, and make sure that it is checked as well as the other options below it.



Your proxy settings will be detected automatically by Zoom. Proxy usernames and passwords may be required in some cases. Adding and to your whitelist is recommended. Using proxy servers or SSL inspections.
Fixing the problem
  1. Make sure your firewall settings and proxy settings are correct by contacting a network administrator.
  2. If your connection is being interfered with by antivirus software, disable it.
  3. If you are unable to connect to Zoom, check with your internet provider.



Software may not allow Zoom to run if it interprets it as a security threat. When you are in System Preferences -> Security & Privacy, click the Firewall tab and you can temporarily disable your Mac’s firewall. If you want to disable the firewall on your Mac, you can click the “Turn Off Firewall” button.
Open Zoom and log in. Simply click the Schedule button.
The Zoom App allows you to schedule proxy authority
  1. Meetings can instead be scheduled by assigning or delegating users.
  2. Instead of a single user (or multiple users) with scheduling privileges, you can schedule a meeting yourself.



Select Firewall Options from the System Preferences menu by going to the Security & Privacy menu -> Firewall. When you click on the plus sign (+), you will see When you click on this, you will be able to allow inbound connections from Zoom. To confirm your decision, click OK at the bottom of the page.
If you are interested in knowing more about the current status of Zoom Services (, please check the Zoom Service Status site ( If you select the Subscribe to Updates option, you will receive a notification by email, text message or webhook whenever a new incident is created, updated, or resolved, depending on the method you select.


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