SNMP counter for HTTP errors

Hi

 

Ive been using a MIB browser to have a look around our BIG IP, which im very new to do. Ive seen a couple of OIDs that look quite useful, like sysHttpStatResp4xxCnt and sysHttpStatResp5xxCnt, which should return a counter for HTTP errors. Id like to be able to pick up the SNMP error counters in OpManager but those OIDs dont return anything. Are there any other OIDs buried away somewhere that will have the desired result? Or is there anyway to get the BIGIP to populate those counters?

 

 

Thanks!