Recently I upgraded a couple of MPX NetScalers to a recent 11.1 build at a customers location. During the following day the customer experienced a lot of disconnecting citrix sessions. I did not experience this issue on a VPX appliance. Turned out to be an issue with the “TLS1.2-ECDHE-RSA-AES256-GCM-SHA384” cypher. And because I want to strive for an A+ rating at ssllabs (Scoring an A+ at SSLlabs.com with Citrix NetScaler – 2016 update) this one is in the list. After removing this cypher from the cypher group the customer didn’t experience any disconnects. So I thought to share this one as you may experience it for your self.
Please also note this Citrix article: https://support.citrix.com/article/CTX220994