E.F.A. Requires the following firewall ports to be opened:
| Protocol | Direction | Port | Description |
|---|---|---|---|
| TCP | in | 25 | e-mail in (SMTP) |
| TCP | out | 25 | e-mail out (SMTP) |
| UDP | out | 53 | DNS out (resolving and RBL checks) |
| TCP | in | 80 | (opt.) web interface (HTTP) |
| TCP | in | 443 | (opt.) web interface (HTTPS) |
| TCP | out | 80 | updates (HTTP) |
| TCP | out | 443 | updates (HTTPS) |
| TCP | out | 2703 | Razor* |
| UDP | out | 24441 | Pyzor* |
| UDP | out | 6277 | DCC* |