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./check_nrpe -u -H 10.210.26.31 -c CheckCounter -a "Counter=\\Server\\Bytes Total/sec" ShowAll
So I suspect its a syntax error with the actual command rather than a problem with nrpe or perfmon... But I have tried every iteration of server\memory\ that I can think of and still no luck!
Have you tried running the counter check without \Server\ in the string? What Windows version are you running this against? And what NSclient version is installed on it. I'll be able to test it on my end once we have that info.