Something doesn't work in a particular piece of software. "Don't they test their program?". "All they need to do is X, obviously they don't know how to code!".
And just to piggyback on this comment, I'm an Android developer and we this information is critical for determining similarities for bug solving.
You would not believe how often there is a bug caused by a specific model of phone. That connection you can only know if you log that for every crash you get.
On my Fritzbox, I needed to add all my Subdomains to a list under:
DNS Rebind Protection
Your FRITZ!Box suppresses DNS responses that refer to IP addresses in its own home network (DNS rebind protection). Here you can specify exceptions for which DNS rebind protection should not apply. Do this by entering the complete name of the host (domain name including the subdomain) in the list.
That's under network settings, advanced. In case you have that.
Something doesn't work in a particular piece of software. "Don't they test their program?". "All they need to do is X, obviously they don't know how to code!".
Sometimes it isn't as easy as you think.