The desc explicitly states this is the count of IPsec other inbound errors, a catch-all for inbound IPsec failures not covered by the more specific counters elsewhere in this MIB. Because this is a catch-all, a nonzero value here without corresponding movement in the more specific inbound error counters is worth escalating to Check Point support with a packet capture, since SNMP alone won't tell you which of the less common failure modes, such as a malformed header or an unsupported negotiated algorithm, is actually occurring. e.g. cpvSaOtherErrIn = 5 after receiving a handful of malformed ESP packets that didn't cleanly fit any of the more specific error categories.