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ASPNET sites don't respond though LB 1 Centos 7.6.1810

Hopefully this makes sense, I require some assistance concerning communication issues with the aspnet websites through HAProxy.

When I updated the OS to Centos 7.6.1810 of one node I found that all of the aspnet sites would not resolve. If I switch to routing the ASPNET sites through a different node which is running CentOS 7.5.1804 they resolve fine.

The HAporxy config for all nodes are the same.

Any ideas?