Dual Server set-up/Kentico CMS

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We recently upgraded to a dual server set-up for our website, which was originally set up by POP and uses Kentico CMS, and we are having difficulty getting it to function correctly across the dual server.  There seems to be some form of issue with the session key.  We believe that it likely related to our Kentico set-up, though it could possibly be the POP code as well; a lot of that code is over five years old now and rather difficult with which to work.

We would be curious to know A) is anyone out there currently using a dual server set-up for their website, specifically with Kentico CMS and B) if anyone might have any advice as to solving this issue, particularly if you have either Kentico CMS or a POP-
designed website on a dual server set-up.

Many thanks!