Aggregated IIS Event Session take a lot of time

[peeradis_s]

Hello I try to investigate performance issue about calling api from web ui

Our Architect is

IIS Web -> HAProxy -> K8sIngress -> API

Then i use dynatrace to check where it slow.

I Found That it Spend a lot of in WebUI Not API Side so i check further.

See That Session is consume a lot of time.

How can i find what the root cause for this? Or I need to Contact Microsoft?

IIS version 10.0.14393.0

[skrystosik · Accepted solution]

You should go to host => edit and there you can enable early adopter feature about IIS Modules tracking:

after this you will see which module is rootcause. You have to restart iis after this change.

Sebastian

[peeradis_s]

It Already On

[peeradis_s]

I look Further and See the Session Module is the problem.

But What i can do next to improve performance.

[skrystosik]

Dynatrace will not help you more here. Problems with session module may have various of reason on IIS:

https://forums.asp.net/t/2154050.aspx?Hang+Requests+in+AcquireReqestState+in+Session+module+after+se...

For example here. You should check IIS forums that are corresponding to this topic.

Sebastian

[peeradis_s]

Thank you @sebastian k.