A third party webservice has whitelisted the public static IP address of my Azure Application Gateway.
I would like to be able to ping/telnet to the IP address of the service from the IP address of my application gateway. Is this possible?
How can I test connectivity from my Application Gateway to that service?
You will not be able to test connectivity from Azure Application Gateway. In App Service you get an option to KUDU console from where you can do TCPPing to test connectivity.
You need to work with your Third party web Service to try access Application Gateway and check the Access logs whether you got any request and response.
Related
I have a question regarding the IP address of my web application.
I deployed my app to azure. The application (API) has been successfully deployed to azure web service and for a client to make a request to the API, the IP address of the app is needed. In azure portal under properties I can find the virtual IP address (e.g. 20.10.200.5 typing it to the browser gives 404) and outbound API addresses.
How to make the API's virtual IP address reachable by clients ?
As an addition to Stanley's answer:
The App Service gets its own URL in the form of <appservice-name>.azurewebsites.net which can be used to access the application / API. You can also Map an existing custom DNS name to Azure App Service making the application / API available through your own domain, like yourdomain.com/api.
Unfortunately, you can't access an Azure App service directly by virtual IP. Virtual IP is bind to the App service plan, one App service plan could contain multiple Azure App services. App service plan maps the domain name with the individual app services, so using a virtual IP is not possible to do that.
I have azure app service which runs .net core web api. This api access several external API s to get data and those external services has to whitelist the outbound ip addresses of my app service.
Azure app service has several outbound ip addresses and it can be change when upgrade/downgrade app service or when make internal changes like changing app service plan or resource group.
Is there any solution in azure to setup this app service behind a forward proxy ?, so i can share the IP of the forward proxy to external parties.
I think the best way would be to add all App services under a virtual network and create a Virtual Network Gateway to all outbound connections.
This would potentially need below azure services to be created:
- Virtual network
- Subnet
- Virtual Network gateway
- Routing tables (to route traffic via Gateway)
A better way would be sharing a domain name rather than IP address. Here's how to configure it directly in the Azure Portal:
https://learn.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain
You can also add an API Management in front of your web app and use it as API gateway and also apply policies on it.
https://learn.microsoft.com/en-us/azure/api-management/configure-custom-domain
I'm trying to serve multiple Azure App Services behind an Application Gateway. These services should only be reachable through the application gateway endpoint. To achieve this, I've done the following:
Added a VNet
Added a subnet, and added all app services to it
Added an application gateway with appropriate rules for pointing to the app service
Added access restrictions to the app service to only allow the subnet of the application gateway, and the public IP of the application gateway
The health probe of the application gateway indicates the service is healthy (and thus reachable), but when I try to make a request to the service trough the gateway using Postman, I get a 403 IP forbidden error. However, when I add my local IP as an allowed IP address to the app service, the request comes through just fine
From what I've read online, adding the public IP of the gateway should be sufficient for allowing access through the gateway, but it seems that requests from my local machine are blocked. Am I getting something fundamentally wrong here?
Edit: I also tried assigning a front-end private IP address to the gateway and adding access for that in the app service, but that also did not work
Edit 2: My configuration
Access restrictions for app service:
access restrictions
Backend pool:
Backend pool
HTTP settings:
HTTP settings
Listener:
Listener
Rule:
Rule
From your description "Added a subnet, and added all app services to it", I assume that you are meaning integrating app with Azure VNet or enable the service endpoint with Microsoft.Web for the subnet. If so, you could remove them. Both are useless in this scenario.
To restrict the access through the gateway, you only need to add the frontend IP address to the Azure App Service access restrictions. For more details, you could refer to this blog https://www.cloudmanav.com/azure/restricting-appservice-accessible-via-appgateway/#
If you have NSG associated with the subnets, you could follow the prerequisites here
https://learn.microsoft.com/en-us/azure/application-gateway/configuration-overview#network-security-groups-on-the-application-gateway-subnet
Edit
You may have redirection configured on your app service or have Azure Active Directory authentication, which causes the redirection. So when redirection happens, the client makes the request directly to app service URL Path contoso.azurewebsites.net/xxx instead of going through the application gateway URL path contoso.com/xxx.
To fix it, you could use a custom domain name to pass the same host name that the application gateway receives to the app service as well, instead of doing a host override. Get more details about this solution here.
We have an Azure Web App and Azure VPN, we've locked down the web app so it's accessible internally only by granting/restricting access via IP addresses (via Access Restrictions page). However users over our VPN are not able to access the web app - when they connect over VPN, the user's external IP address is not from our internal network. We do not want to whitelist everyone's IP address.
If we had the internal IP address of the web app, we have a few options we could try, but we assume this is not available to us.
How would we allow access to a web app for users over a VPN?
Is this something API Management would solve?
If you don't want to whitelist everyone's IP address. You could involve front-ending the Web App with an Azure Application Gateway and restricting access to the Web App such that only connections from the Gateway are allowed.
Azure Application Gateway is a web traffic load balancer. It has a public or a private frontend or both backends, it must deploy in a dedicated subnet. The subnet also supports to restrict the network inbound and outbound traffic with NSG. In this case, you can deploy a private app GW, then the users over VPN will send the HTTP/HTTPS requests to the APP GW frontend, the APP GW receives the requests via Listener and routes the traffic to the appropriate backends based on the routing rules. An application gateway can communicate with to on-premises servers when they're connected by Azure ExpressRoute or VPN tunnels if traffic is allowed. See supported backend pools and how an application gateway works.
You could get more references from the third way in this blog.
App Service IP Restriction for Application Gateway with WAF
I want to setup Application Gateway WAF in front of multi-tenant (non-ASE) App Service Web Apps.
I know this is possible now, according to official document.
For security, inbound traffic to Web Apps should be restricted to only allow requests for connection the application gateway Public IP. But I couldn't find the way to do it.
Idea 1. Using VNet integration:
It's not possible to using "App Service Vnet Integration" cause it's not possible to specify App gateway's VNet.
Moreover, in my understanding, VNet integration can't restrict inbound traffic.
Idea 2. Using IP Restriction config of App Service:
Application Gateway's Public IP Address can be configured as Dynamic one, Static IP Address can't be chosen.
So, I think it's not possible to specify Application Gateway's Public IP Address to IP Restriction config of App Service, cause configured IP is static but actual IP can be changed.
Any good idea?
The Application gateway IP address can change if the gateway is stopped and started by the customer.
So if you have not stop and start the application gateway, the IP address will not change.