asp.net - .net session timeout application - object reference not found -


good day

my first post on here weird , first time issue ever using our diagnostics tool have tool hp called - hp diagnostics monitors either java/.net based application servers down code level , break down server requests etc identify issues.

our customer runs asp.net 3.5/4 application iis 6/7

we instrumenting application our diagnostics agent information on application server requests etc identify issues.

now problem when start our tool, after close hour application starts have session problems. getting errors e.g - object reference not found - application user not valid user

seems causing havoc application sessions

we not application other monitor it.

the application in house built , getting information developers scarce

do guys know can investigate see causing these type of errors application iis asp.net

any appreciated

mario


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