AWS - Windows Authentication fails with AWS Application ELB

Scope 

Prevent Windows Server Authentication logon issues.  This issue only occurs if you are in HA mode on the LoadMasters.

 Cause

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 an HTTP Layer 7 Elastic Load Balancer configured in AWS.

Solution

Redeploy KEMP VLM with legacy layer 4 Load Balancer.

 

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