If the results of the Chatwork Live Zoom migration network diagnostics read "May not work properly," try the following troubleshooting methods:

 

1. Communication issues

HTTPS communication (failure)

HTTPS communication is the technology that allows encrypted communication with Zoom servers.

• Possible causes:
  • A firewall or security software is blocking communication with Zoom.
  • The proxy server is not configured correctly.
  • The network has a strict security policy. (Especially company networks, etc.)
     
• Solution:
  • Check the firewall settings: Verify if the domains *.zoom.us and *.zoom.com are allowed in your PC's firewall settings.
  • Temporarily turn off security software: Antivirus or other security software may be blocking communication. Disable it temporarily and check if there is any improvement.
  • Consult your network manager: If you are using a company network, contact the IT department or network manager, and check if the HTTPS (TCP port 443) communication to "*.zoom.us" is allowed.

WebSocket communication (failure)

WebSocket is a technology that provides two-way communication in real time.

• Possible causes:
  • As mentioned earlier with HTTPS, a firewall or proxy server may be blocking WebSocket communication.
     
• Solution:
  • Check the firewall or proxy: Contact the network manager and check if WebSocket communication is allowed. It is especially important that the proxy server supports the WebSocket protocol.

Data Channel communication (failure)

A Data Channel is used to send and receive data other than video and audio, such as screen sharing.

• Possible causes:
  • In most cases, the firewall is blocking the User Datagram Protocol (UDP) that Zoom uses. Zoom preferentially uses UDP for high-quality communication.
     
• Solution:
  • Open UDP ports: Request the network manager to allow communication to UDP ports used by Zoom (typically 443,3478, 3479, and the range 8801–8810).

 

2. Network quality and bandwidth issues

Upload/Download network quality

Quality refers to communication stability.

• Possible causes:
  • The Wi-Fi signal is weak or unstable.
  • Someone else on the same network is performing large-volume communication (e.g., watching videos, playing online games, or downloading large files).
  • The internet connection itself is congested.
  • There is a problem with the generation or performance of your router.
     
• Solution:
  • Switch to wired LAN: This is the most effective solution. If possible, connect to the router directly using a LAN cable instead of using a Wi-Fi connection.
  • Go close to the Wi-Fi router: If using Wi-Fi, move to a place that is closer to the router and has no obstacles (e.g., walls or microwave ovens).
  • Restart the router: Switching off the router and switching it back on after a few minutes may stabilize its operation.
  • Stop communication with other devices: During meetings, refrain from using PCs and smartphones connected to the same network.
  • Use the 5 GHz Wi-Fi band: If supported by your router, connecting to the 5 GHz Wi-Fi band may stabilize operations because it minimizes interference with microwave ovens and so on.

Upload/Download network bandwidth

Bandwidth refers to the communication speed (the amount of data that can be sent or received at once). Chatwork Live requires a certain speed to operate optimally.

• Possible causes:
  • The internet plan you are subscribed to has a low speed.
  • The network is congested, and the original speed cannot be achieved.
  • The speed is reduced due to using a Virtual Private Network (VPN).
     
• Solution:
  • Close unnecessary applications: Other applications running in the background of the PC (e.g., cloud storage synchronization or OS updates) may be consuming bandwidth. Be sure to close them during meetings.
  • Consider disabling the VPN: If you are connected through a VPN, try disabling it and check if the speed improves.
  • Review your internet plan: If bandwidth is consistently insufficient, consider switching to a faster internet connection.