We added a new sensor on the probe, which schould receive SNMP traps from (for example an EMC SAN). We defined the OID value and the listening port in the sensor settings. From the web interface of the EMC SAN we send some testing traps to the PRTG. On the PRTG we installed a packet sniffer which logged the testing trap from the SAN. In the web interface of the PRTG the "OIDs Received" value ist still 0. What is going wrong?