Forum Discussion

jafar201_133847's avatar
jafar201_133847
Icon for Nimbostratus rankNimbostratus
Sep 17, 2013

ASM in learning mode issues

Greeting we are facing a strange issue since 3 days a go when Security team start F5 ASM in learning Mode user Start complaining from unusual Slowness and Odd behavior , some User report that they ...
application delivery
microsoft
performance
Cody_Green's avatar
Cody_Green
Icon for Employee rankEmployee
Sep 17, 2013

The first thing I would do is remove the HTTP Class profile that ties ASM to the virtual server (9.x to 11.3) or common policy in 11.4 and see if the behavior persists.

 

At first glance I'm not sure ASM is the culprit. ASM by default will not redirect a user to the logon page, it will typically respond with a block page.

 

As for the "This page can't be displayed", this may be caused by a TCP reset (RST) packet being sent from the backend server. You can view SOL13223 to see to configure F5 to log the reset reason.