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Firewall and antivirus settings

If users cannot access freispace or some features do not update correctly, a firewall, proxy, or antivirus web filter may be blocking the connection. Ask your IT administrator to check the following:

  • Allow outbound HTTPS and secure WebSocket (WSS) connections over TCP port 443.
  • Allow freispace.com and all its subdomains using *.freispace.com. Some filters do not include the root domain when a wildcard is used, so allow both entries.
  • Ensure WebSocket connections are permitted. If HTTPS traffic is inspected, check that the inspection does not prevent WebSocket connections from being established.

If your network requires IP-address allowlisting, contact us for guidance rather than relying on a fixed IP address.

Known Problematic Antivirus and Firewall Software​

Sophos​

Sophos has observed blocking access to freispace. If users on a Sophos-protected network have connection issues or encounter blank pages, check its web filtering and firewall rules and add the freispace domains above to the relevant allowlist.

Fortigate 2601F​

Fortigate 2601F has been observed throttling or delaying freispace requests, resulting in bursts of requests.