I have a couple of web applications on an Azure server. A client allowed the domain to lapse, and I can no longer access the DNS settings for this domain. The domain's DNS settings (A records, CNAMES) are still authorized in Azure to control traffic for the server's IP address. So, any app I create on this server now resolves to the domain that is no longer under my control.
How do I get myself out of this pickle? Can I change the server's IP address? I have not been able to find out how to do that. Can I de-authorize the DNS settings that now control access to this IP address?
If you want to remove access to the app from a domain, you just remove the domain from the App Service.
DNS tells users where to go for a particular domain name.
If your app doesn't mention it as a domain, the request won't be routed to it.
Remember that addresses in Azure App Service are shared so it requires that you actually explicitly mention the domain in the app service's configuration.
Ugh. Ok, my issue was that I was redirecting to the domain in my web.config.
Related
Some of my apps are not working from some customers site, I later discovered that this was because I am using the default websites for my app hosting that is the url is myapp.azurewebsites.net which was not whitelisted on the customers firewall. The customer whitelisted my website domain name and its sub domain names .i.e mywebsite.com and *.mywebsite.com are all whitelisted.
If i were to create CNAME record which has a CNAME pointer to the azure default web app for example myapp.mywebsite.com points to myapp.azurewebsites.net, will this get around the issue ? Or do I need to whitelist myapp.azurewebsites.net Or its IP address that is the IP address of myapp.azurewebsites.net ?
Firstly, by default, apps hosted in App Service are accessible directly through the internet and can reach only internet-hosted endpoints. So, typically, anyone with the URL without any specific local network/firewall/proxy restrictions can access the WebApp URL.
As I understand, your WebApp is open to the public and only a few users (on a specific network), have trouble accessing the site. Plus, there are no access restrictions that you have implemented from the WebApp side.
Just to highlight,
Network administrators often deploy proxy servers, firewalls, or other
devices, which can help secure and give control over how users access
the internet. Rules designed to protect users can sometimes block or
slow down legitimate business-related internet traffic. This traffic
includes communications between you and Azure over the URLs listed
here.
Reference : Allow the Azure portal URLs on your firewall or proxy server
So, on case-case basis, for the affected network, you may have them add appservice.azure.com (Azure App Services) in the allowed list.
Or
As your customer performed – “The customer whitelisted my website domain name and its sub domain names .i.e mywebsite.com and *.mywebsite.com are all whitelisted.” have them add the URLs to allowedlist.
Or
Since IP address of your WebApp (see the reasons for the change), the best route would be for you to set up a custom domain for your WebApp.
Kindly check this doc - Tutorial: Map an existing custom DNS name to Azure App Service
The CNAME maps to the app's default hostname instead, which is less susceptible to change. | | Wildcard | *.contoso.com | CNAME record. |
-- As a side note (as indicated above), by setting up access restrictions, you can define a priority-ordered allow/deny list that controls network access to your app. Which is the opposite of your scenario, just sharing as FYI, in case you wish to know about access restrictions from WebApp side. Set up Azure App Service access restrictions
I am very new to Cloudflare. So please bear with me. I need to access my website (hosted in Microsoft Azure - App Services) via IP address instead of the domain name.
To do this, I need to add HOST=www.mydomain.com into the HTTP header when requesting the website via IP address.
I heard it can be solved via Cloudflare, but the person I asked will not elaborate further. Is it possible? If yes, what service should I purchase? Any manual or instruction will be appreciated.
If Cloudflare isn't possible, do you have any service recommendations?
Thanks :)
The reason the host header is needed is because Azure App Services are multi-tenant (multiple apps on a single IP) by default. So, the server needs some way to know where to route your request to (the host name). In addition, IPs are not guaranteed to be static (they can change as you scale for instance).
It should be possible to secure a single static IP address using the following method -
https://learn.microsoft.com/en-us/azure/app-service/overview-inbound-outbound-ips#get-a-static-inbound-ip
What is unclear is whether or not this IP would also be dedicated (meaning only your domain would use it). This is what would be required in order to allow you to access the app service without a hostname specified.
Cloudflare will not solve this issue, as it sits at the DNS layer (domain name access). Accessing a server via IP would bypass Cloudflare entirely.
Is there a way to assign an IP to a Azure App Service? I just deployed my application and it's working correctly. But the problem is we need our domain to point to that App Service. Since our domain is website.com and the app service domain is website.azurewebsites.net is there a way to point the website.com to the azure url? We have a reverse proxy where we can just assign the IP and that will load the site. So if the site is website.azurewebsites.net and ip is 123 then in our reverse proxy we just assign 123 to our domain website.com. So whenever someone access website.com they are presented with website.azurewebsites.net. Is there a way to assign an IP to this app service?
Like silent mentioned, use CNAME mapping to map the domain, alternatively Web Apps actually have a list of possible outbound IP addresses, but I dont think thats reasonable, just use CNAME (you also need to verify your domain in Azure).
App Services is a shared servers which means many App Services is behind same IP hence you need to configure Custom Domain on your App Service to get it to work:
https://learn.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain
The shared IP can be found under your App Service on the blade Settings->Properties.
The name is "Virtual IP address"
I am using Azure App Service to host my NodeExpress application, I am right now stuck at a very strange requirement.
I have 2 different azure app services.
1) myApp
2) sampleApp
I have a domain pointed at myApp. (Added hostname www.myapp.com)
now I want to delete myApp and shift my hostname (www.myapp.com) to sampleApp.
now my Question is,
will it change my IP Address? (This I think it would because I haven't bought any static IP)
if my app service pointing IP is changed, will I have to do anything with the domain DNS manager to move www.myapp.com in hostnames of sample app?
I don't have access to DNS Manager because client has it. I have to tell client to add CNAME to verify domain ownership. I want to point this domain to different app service without adding delay of asking my client to change its cname to verify domain ownership.
You can actually migrate the domainname without downtime by using a verify record. Just create the record:
awverify.www.mydomain.com CNAME mynewnodeapp1.azurewebsites.net
That will enable you to add the hostname www.domain.com to sampleApp in azure (and add an SSL binding).
Source: https://learn.microsoft.com/en-us/azure/app-service/manage-custom-dns-migrate-domain
You have to register the new CNAME from your web application in the DNS server before adding it to Azure App Service. Right now you have something like this:
www.mydomain.com CNAME mynodeapp1.azurewebsites.net
First, change it to your new application address:
www.mydomain.com CNAME mynewnodeapp1.azurewebsites.net
And then add the custom domain to your new web application.
App Service does provide you with a public IP address, but it's not guaranteed to remain the same, although it's unlikely to change. Said that, as long as you keep using CNAME, you shouldn't have any problems. If you delete the original app and recreate using the same Azure FQDN, then you don't need to change anything on customer DNS settings, Azure will be able to verify the domain successfully in this case.
One of our customers is planning to change the public IP address of their server where their website is hosted (in-house on IIS).
The website was built with Classic ASP.
What changes are needed on the server after the IP address change, and where would they be?
(I know this question is very vague but this is all the information I have for now - apologies.)
Normally there will be no dependencies on a specific IP address in classic ASP.
IIS ofcourse manages on which IP address(es) and which hostnames the (asp) site will respond (in the bindings setting for the site), and the public DNS settings are responsible for routing the proper hostname to the correct (new) IP address, but ASP code doesn't care about hostnames or ip-addresses, it just responds to whatever IIS thinks should be handled by the site in question.
The DNS will propably be hosted at the companies Internet provider, you should check if the site in IIS has the correct bindings, and if it is not configured to respond to specifically the old IP address.
If the server uses multiple IP addresses you may need to alter the bindings in IIS manager to ensure that the domain of your website is associated with the correct IP, and obviously you will need to update the DNS record for your domain. Neither of these are specific to Classic ASP