Hi All,
We have an issue in our CRM environment (Dynamics 365 server v8.2.0002) whereby calls from BizTalk to the CRM organization.svc URL are occasionally failing (but consistently when under load) with the following error coming back from CRM (Verified in IIS logs):
"500 internal server error - The security context token is expired or is not valid"
Flow is as follows
BizTalk -> Barracuda Load Balancer set to Cookie Persistence mode -> CRM Servers (Three)
And back the other way.
All traffic flow is on an internal LAN.
Does anyone have any advice or previous experience with this error or are there some settings we can check or verify are correct based on best practice when using a hardware load balancer?
What has been checked so far:
- NLB is ticked on all CRM servers on the deployment wizard (Three in total)
- Persistence mode on the barracuda load balancer has been set to both none and cookie based
- Checked packet flow to ensure the load balancer isn't altering the packet or headers in any way
- Issue is occurring when hitting all three CRM servers, not isolated to a specific one
- Issue is intermittent but occurs more frequently when server is under load
- Made sure system times on all three systems are in sync. (Within the minute)