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While Clustered Tomcat and Sticky Bits are not mutually exclusive....if you have clustering, you shouldn't need sticky bits....the entire point of sticky bits is that you established a session with server x....and server y knows nothing about it, so you need to stay attached to server x....if you have clustering, that session is shared, thus no need for staying with x as you can 'roam around'...so, you don't need sticky....
After having said all of that, I notice that you are running 7.6.04....I don't recall at which version Mid-Tier reached the ability to do as I said above....but I'm not 100% sure that it was there in 7.6.04...I know for sure it was there in 9.0....potentially 8.1.02....but I'm not sure about 7.6.04. You could try upgrading your Mid-Tier to something newer and see if the problem goes away.....Do you have documentation that clustered tomcats works with Mid-Tier in your version?
As regards sticky bit, I've even tried the same tomcat cluster configuration in 19.08. Without stickiness, user can't log into ARS at all (find attached fiddler log taken from 19.08). We have to suppress this issue by switching algorithm from round robin to ip_hash in Nginx.
The 7.6.04 document is no longer available on web site. But I can confirm following section
Configuring BMC Remedy Mid Tier as a shared service - Documentation for Remedy Action Request System 9.0 - BMC Documenta… is not available until version 9.0 (didn't find same content in 8.1). Although it's not officially supported, can I expect MT 9.0 may be compatible with AR 7.6.04? If so, it is worthwhile to try out MT 9.0.
fiddler2.saz 473.6 K
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In theory, lj is right. But unfortunately we can't get the Midtier running without the sticky either. With us this is somehow connected with RSSO.
It is the same with DWP. Without Sticky nobody can log in correctly.
Just want to confirm that I have had Tomcat 8.5, Mid Tier 19.02 and RSSO 19.0x (don't remember which release exactly) using TC simple clustering and without sticky sessions, all work as expected. I know it can work.