This article applies to:

• WebMarshal 6.1 and above
• Firefox

Symptoms:

• WebMarshal HTTPS Content Inspection enabled.
• Firefox does not detect version updates.
• Attempts to manually check for updates (Help > Check for Updates) will fail with one of the following errors:
  Update XML file malformed (200)
  AUS: Update XML File Not Found (404)

Causes:

Firefox checks if updates are available by contacting https://aus2.mozilla.org/. As part of this process, Firefox examines the HTTPS certificate to see who it was issued by. If the issuer is unknown, or is not one of the issuers built into Firefox, the update process fails. WebMarshal's content inspection root certificate is not built in and is therefore causing Firefox to fail to update.

Resolution:

Firefox will update correctly if WebMarshal is configured so that it will not inspect connections to https://aus2.mozilla.org/. 

To avoid inspecting these connections while using HTTPS Content Inspection for otehr sites, add an HTTPS rule for this site using the action Permit access and do not inspect content.