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50% of the time, this is a nice feature.
The other 50%, I hate it as I have to clean up the BS it adds. Like
using static System.Runtime.InteropServices.JavaScript.JSType;
using System.Runtime.Intrinsics.X86;
using System.Security.Policy;
using Twilio.TwiML.Voice; Seriously? Where does it think I need those???  And yes, I know I can turn this off, somewhere, but the 50% when I like it, I want it. 
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I'm not even sure if this is a programming question, a networking question, a Windows question...
I'm completely at a loss of where to look!
I'm developing a web app with a service in ASP.NET 8, both need a subdomain.
So I have sub.localhost:1234 for the web app and sub.localhost:5678 for the service.
I can access both in my browser, but my web app can't access the service ("no such host is known").
When I'm at home, it works.
When I'm at home and on VPN it doesn't work.
It works with and without VPN for my coworker, but only from home.
At the office, it doesn't work with or without VPN for both of us.
At first I though the VPN was the problem because at home it worked without the VPN, but today I'm at the office and it doesn't work at all (even though I developed this service at the office!).
We've deployed both in an Azure app service with the subdomain properly registered in the DNS and a valid certificate.
The web app can't access the service, again because "no such host is known".
We can, however, access the service in Azure from our development environment (sub.localhost:1234), but for me only without VPN and for my coworker only with VPN and only from home.
We can access the service from its Azure domain (e.g. myservice.azurewebsites.net).
The plot thickens, because for my coworker one specific controller does seem to work at the office, but not from home (it doesn't work for me at all).
The controller isn't particularly interesting.
When I remove the subdomain everything works.
It seems completely random and I can't even think of where to look...
At least I can rule out it's not a firewall issue (turned it off completely with no result).
Has anyone seen this before or have a clue of where to look?
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sub.localhost makes no sense to me at all.
If we are saying localhost, it's a given that everything is at 127.0.0.1.
Maybe there is some reason you need *different* domains though for local app<->service.
In that case, I would ditch sub.localhost and go with something more akin:
myappservice 127.0.0.1
myapp 127.0.0.1
added to %windir%/system/drivers/etc/hosts
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The sub domain is any customer location code.
So it's loc1.localhost or loc2.localhost.
I've thought about the hosts file, but that won't explain why it works in my browser, but I can't ping it and why it works at home, but not at the office and that my coworker has a varying mileage.
It doesn't work in Azure either, which is even weirder, since all subdomains are registered in a DNS within a "proper" domain.
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If the subdomains are also located on different subnets things get more hairy than a Minoxidil spill.
Running things local, all should work with the host file entries for 'real' domains... <client>.myapp and <client>.myappservice is probably what I would pick.
I think maybe there is confusion about the routing happening server-side vs client?
Which really just depends on the code. If the code to hit the service is c# server-side vs something like an inline json call from js, then which DNS resolution (and which hosts file, client v server) is getting used would be different.
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Hmm, localhost is not technically a domain name, so I guess that is why it is elephanting when trying to resolve a sub domain from it.
Two things I can think of to try:
1. use sub.127.0.0.1:1234 (or possibly sub."127.0.0.1":1234
2. add sub.localhost to your hosts file. (pointing to 127.0.0.1 or localhost)
Good luck
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RainHat wrote: so I guess that is why it is elephanting when trying to resolve a sub domain from it
But only under specific (unknown) circumstances, like being at the office or having a VPN.
I've thought about the hosts file, but that won't explain why it works in my browser, but I can't ping it and why it works at home, but not at the office and that my coworker has a varying mileage.
It doesn't work in Azure either, which is even weirder, since all subdomains are registered in a DNS within a "proper" domain.
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When you say you cannot ping it, do you mean you get no response or you get no name resolution?
Try powershells from the machines where the app is running if you can...
Test-NetConnect <ip or fqdn> -p <port> ... I may be off on some of that syntax.
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From comments at top of hosts file:
# localhost name resolution is handled within DNS itself.
# 127.0.0.1 localhost
# ::1 localhost
If I add a line to hosts file:
127.0.0.2 sub.localhost
then I can do:
>ping sub.localhost
Pinging sub.localhost [127.0.0.2] with 32 bytes of data:
Reply from 127.0.0.2: bytes=32 time<1ms TTL=128
Mircea
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I've thought about the hosts file, but that won't explain why it works in my browser, but I can't ping it and why it works at home, but not at the office and that my coworker has a varying mileage.
It doesn't work in Azure either, which is even weirder, since all subdomains are registered in a DNS within a "proper" domain.
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I think at least some browsers (Chrome, I'm looking at you!) have their own DNS resolver. VPN adds another level of weirdness and anyway localhost is not a valid domain name. Are you trying to solve all the possible interactions between these parts or you just want your app to work? If it's the first one, I'd like to hear the result, maybe in an article or tip here. If it's the second, just add a line to your hosts file. It has the highest priority in the DNS resolving order[^] and it just works.
Mircea
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I think your workplace might have some dodgy network filters.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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AntiTwitter: @DalekDave is now a follower!
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In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Wordle 1,084 4/6*
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Wordle 1,084 3/6*
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I hope this is not going to be called programming question, but I am running out of non AI forums to post this.( This forum Linux subforum is of no help - this is not programming issue )
I just had a total "no boot" failure of my grub file - working multi-operating system.
( Total power outage / failure caused this)
Ever since I started using Linux Ubuntu I have been unable to figure out HOW TO MAKE FULL DUPLICATE of perfectly working OS. ( Using "DD" command did not work!) I have several HD, space in no issue.
I was hoping use something likes RAID to do this. I am well aware of RAID issues, but I am desperate to have this resolved before another catastrophic failure.
PS
This time my working grub recovered because another , non used , but operational Ubuntu grub file was "updated/ upgraded".
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I think the title of your post is hilarious because it sounds so much like when people ask (quite frequently,) "How to solve this problem?" and it's a question that would take pages and pages to answer.
The difficult we do right away...
...the impossible takes slightly longer.
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Perhaps I am on wrong planet- I was under the impression this forum, in particular, was in existence to help solve problems. I guess I am wrong ... again.
But I do appreciate your post for staying on the subject and
you not telling me to RTFM or "get an new one ".
Hope somebody will take "the first baby step" to start the mentioned pages leading to solution.
PS
Just went thru few "fsck" to fully (?) recover from the grub failure...
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There are many packages out there that can duplicate an entire partition or an entire disk. Many of them have a version that can be installed on a boot CD (or USB drive). OriginalGriff swears by AOMEI (runs on Windows, or from a Windows PE boot disk), but there are others.
AIUI, the grub is not part of any partition, so duplicating the partition is insufficient to recover the O/S. It is better to duplicate the entire disk, assuming that you have space available. As far as recovering the grub is concerned, I would assume that you start from a boot CD (or USB drive) containing the appropriate version of Ubuntu, but I'm unsure as to how to progress from there. 
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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