This read-only counter, in packets, tallies malformed RADIUS Accounting-Response packets received from this server, such as ones with an invalid length, excluding bad authenticators and unknown types which are counted separately. Admins watch it to catch a server or network path corrupting or mis-generating accounting responses, distinct from authentication or type-mismatch problems. For example, a rising count here while radiusAccClientExtBadAuthenticators stays at zero points specifically to packet-length or formatting corruption rather than a shared-secret mismatch.