HAProxy and (purchased) wildcard cert?
I'm trying to get my HAProxy working with my wildcard cert e.g. *.mydomain.com for two servers.
Server 1 is an Exchange + IIS server and server 2 is a NextCloud server.
When I go server 1 over my WAN it works without any issues and I can even access the other SNI's that host some small sites (same wildcard and even Let's Encrypt). When I go to server 2 I get a "503 Service Unavailable" error message from the HAProxy.
- mail.mydomain.com = works
- cloud.mydomain.com = does not work
- site1.contoso.com = works
- site2.acme.com = works
How can I make my HAProxy work with multiple SNI's (that are in the backend on different servers) use the same cert?
Found the issue, apparently the health check settings in the backend configuration was the "culprit".
The default setting is HTTPS check and changed it to a basic (socket) check.
So it had nothing to do with my cert or HAProxy configuration itself (beside the health check setting).