If there are connection issues between Shelly devices and the cloud due to a firewall or similar, traffic to these ports and addresses must be allowed
| Port | Protocol | Direction | Purpose |
| 80 | TCP | Inbound/Outbound | Local HTTP control |
| 443 | TCP | Outbound | Cloud communication |
| 53 | TCP | Outbound | DNS resolution |
| 5353 | UDP | Inbound/Outbound | mDNS for discovery |
| 5683 | UDP | Inbound/Outbound | CoAP (for older Shelly devices) |
| 6010-6022 | TCP | Outbound | WebSockets (Shelly Plus/Pro) |
| 6110, 6113 | TCP | Outbound | Additional RPC/WebSockets |
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*.shelly.cloud(This is the most important one, as it includes the cloud, updates, and regional servers) api.shelly.cloudnotifications.allterco.com