What causes "Close CRM Calls Not Connecting"?

VPN interfering with WebSocket traffic Company firewall blocking the calling service Recent network or security changes Telephony provider blocking the destination number

How do I fix "Close CRM Calls Not Connecting"?

1. Reset the connection: Restart your router and computer Close and reopen the Close app Disconnect from any VPN and retry 2. Allow calling traffic through the firewall: Allow WebSocket traffic to the calling service on port 443 Add 168.86.128.0/18 to firewall rules Allow UDP from those IPs on ports 10000-60000 3. Isolate and report: Try another internet connection Ask a coworker if they see the same error Click the black flag icon on the call and report it, or email support@close.com

Close CRM Calls Not Connecting

Ongoing Web, desktop Updated November 13, 2026Based on 2 user reportsHow we research

Quick answer

Calls fail to connect in Close when the browser cannot hold a WebSocket connection to the calling service, often because of a VPN or firewall. Disconnect the VPN and allow port 443 WebSocket traffic.

Most likely fix: Reset the connection

How to fix it

Try these in order — the most common fix is first.

1. Reset the connection
1. Restart your router and computer
2. Close and reopen the Close app
3. Disconnect from any VPN and retry
Did this fix it?
2. Allow calling traffic through the firewall
1. Allow WebSocket traffic to the calling service on port 443
2. Add 168.86.128.0/18 to firewall rules
3. Allow UDP from those IPs on ports 10000-60000
Did this fix it?
3. Isolate and report
1. Try another internet connection
2. Ask a coworker if they see the same error
3. Click the black flag icon on the call and report it, or email support@close.com
Did this fix it?