MAVP-751 — ICAP server responded by unclear response
The ICAP server used as an antivirus engine should respond by by the X-Infection-Found header (or similar ones). If it does not to do it, the result should be estimated from the ICAP protocol status code (e.g. 204 is CLEAN). This message reports the situation when the proxy does not understand the status code.
The particular result of this engine will be set to ERROR.