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 | *.zoom.us |
TCP | 443、8801、8802 | All Zoom clients | IPv4: 3.7.35.0/25 IPv6: |
UDP | 3478、3479、8801 – 8810 | All Zoom clients | IPv4:
3.7.35.0/25 IPv6: |
Zoom Phone firewall rules
Connection type: Zoom Phone
Note:
• 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 | 8.5.128.0/24 64.211.144.0/24 65.39.152.0/24 69.174.57.0/24 103.122.166.0/23 120.29.148.0/24 147.124.96.0/19 149.137.0.0/17 149.137.25.0/24 149.137.41.0/24 162.12.232.0/22 173.231.92.0/24 173.231.94.0/24 192.204.12.0/22 209.9.215.0/24 213.19.144.0/24 213.19.153.0/24 213.244.140.0/24 |
TCP | 390 ( see Note ) | All Zoom clients | 3.21.137.128/25 3.235.96.0/23 |
UDP | 20000-64000 | All Zoom clients | 64.211.144.0/24 65.39.152.0/24 69.174.57.0/24 103.122.166.0/23 147.124.96.0/19 149.137.0.0/17 149.137.25.0/24 149.137.41.0/24 162.12.232.0/22 173.231.92.0/24 173.231.94.0/24 207.226.132.0/24 209.9.211.0/24 213.19.144.0/24 213.244.140.0/24 |
Zoom website firewall rules
Connection type: Zoom website
protocol | port | sender | address |
TCP | 80、443 | All Zoom clients | *.zoom.us *.cloudfront.net |
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 | ocsp.digicert.com crl3.digicert.com crl4.digicert.com crl.godaddy.com certificates.godaddy.com crl.starfieldtech.com certificates.starfieldtech.com ocsp.godaddy.com ocsp.starfieldtech.com |
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 zoom.us and .zoom.us proxies or SSL inspection.
Firewall rules for other Zoom services
- Meeting connector firewall settings
- CRC (Cloud Room Connector) Firewall Settings
- Virtual room connector firewall settings
- Firewall settings for receiving emails from Zoom
Conference connector, etc.
- Conference Connector Firewall Settings
- Cloud Room Connector firewall settings
- Virtual Room Connector Firewall Settings
Related article
- Zoom Rooms firewall settings
- I want to know the usage of port requirements (TCP/8801,8802,9090 UDP/3478,3479)
- System Requirements (Zoom Rooms)
- Wireless (WiFi) connection problems
- [Administrator] User management
- Please tell me the required network bandwidth
- Meeting and webinar error codes and messages
- How to install the application (PC version)
- Zoom Rooms firewall settings
- On Windows, there is a problem that the Zoom app cannot be uninstalled. What should I do?