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502 Bad Gateway The server returned an invalid or incomplete response.

Running into this error?

502 Bad Gateway
The server returned an invalid or incomplete response.

This error only popped up when keepalived was started.  Otherwise just with HAproxy, a timeout was seen. It appeared as if it was a keepalived config error.  In this case, it was due to a faulty HAproxy configuration:

[root@jenkins01 jenkins]# diff /etc/haproxy/haproxy.cfg-diff01 /etc/haproxy/haproxy.cfg
46c46
<     server         jenkins01.nix.mds.xyz    jenkins01.nix.mds.xyz:10443 ssl check check-ssl verify none

>     server         jenkins01.nix.mds.xyz    jenkins01.nix.mds.xyz:10443 check check-ssl verify none
[root@jenkins01 jenkins]#

The ssl directive was missing from one of the lines above.

Cheers,
Tom
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