Hi Santosh,
Hard to know what can be wrong with such a log only.
Please help us to help you!
Gatling version?
Platform? (windows, macOS, linux? Which flavor?)
Which launcher? (sbt, gradle, maven, bundle, Gatling Enterprise; version and flavor?)
Can you provide a reproducer as requested in our guide?
For soak test (long running test with few users), we generally remove all exitHereIfFail as we don’t want to stop the whole simulation if one user fail.
Do you own every server called by your simulation? Do you manage all the policy rules?
Often, third party servers are protected against (D)DoS or other strange behavior.
Having the same IP regularly call your server is a “strange” behavior when it lasts for hours.
Lots of different things can be a cause, here.
So, we need more information to help you.
Cheers