How to Mitigate Windows Auth failures with AWS Application ELB
Prevent Windows Server Authentication logon issues. This issue only occurs if you are in HA mode on the LoadMasters.
Windows Authentication (either Kerberos or NTLM fallback) needs for the TCP connection to maintain the same source port in order to stay authenticated. This does not happen when you have a HTTP Layer 7 Elastic Load Balancer configured in AWS.
Redeploy KEMP VLM with legacy layer 4 Load Balancer.