All of the sudden Varnish fails to start in my development environment, and
gives me the following error message:
Message from VCC-compiler:
Backend host "redacted-hostname": resolves to too many addresses.
Only one IPv4 and one IPv6 are allowed.
Please specify which exact address you want to use, we found all of these:
555.123.123.3:80
555.123.123.3:80
555.123.123.3:80
I have changed the hostname and the IP above to not expose our server, but all
three IP numbers are 100% identical. Shouldn't Varnish be able to figure out
that in that case it can just choose any one and it will work as expected? It
really should remove duplicates, and only if there are more than one
non-duplicate IP then it should fail.
The problem is that the backend host is a so called "app service" in Microsoft
Azure, which is basically a platform as a service (PaaS), where Microsoft
handles the networking including the domain name (no user access it directly).
I have no idea why it suddenly resolves to multiple duplicate IPs.
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