Zoom Room Error Code 5

Hi ​@Tim Senese,

Thank you for reaching out and joining Zoom community. The Zoom Rooms device thinks the current date is 12/24/2025, but the certificate it’s seeing is not valid until 12/29/2025 (“Certificate Not Valid Before”). That will trigger Error Code 5 even if the time zone is correct.

So the key question isn’t Mountain Time vs another zone—it’s whether the Zoom Rooms computer/appliance itself has the correct date/time and is successfully syncing time.

Try this in order:

1. Fix time on the Zoom Rooms device (not just Crestron)

• On the Zoom Rooms PC/Mac/appliance OS, set:
  • correct date
  • correct time
  • correct time zone
  • enable automatic time sync (NTP) if available
• Then reboot the Zoom Rooms device. Zoom’s guidance for Error Code 5 is to correct the system time and restart Zoom Rooms. 1

2. If time keeps drifting or won’t sync: check network time (NTP) Since the room was offline for months, it’s common for devices to come back with a bad clock and then fail to sync if:

• NTP is blocked
• DHCP options changed
• the device can’t reach your NTP servers

3. If time is correct and it still says “untrusted certificate”: suspect TLS inspection / proxy / captive portal A network switch by itself usually wouldn’t cause this, but network security devices can. Common causes:

• SSL/TLS inspection (the network presents its own certificate)
• proxy requiring auth
• captive portal splash page
• firewall rules blocking Zoom endpoints so the device is getting intercepted/rewritten traffic

This also fits your symptom of Crestron firmware updates getting stuck/timeouts.

You may also check out this link for more information.

Hi ​@Tim Senese,

Just checking in, have you had a chance to review the latest response to your concern?

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