I've run the suggested commands on the Kudu console to check for an outbound IP and nothing pops up.
Evidence :(
Under properties within the App Services menu, no outbound IP is listed either.
Evidence 2
I did not setup this Azure Stack Account or this App Services Web App. I think it might have been set up in some "isolated" version. Is it possible to change some setting somewhere to allow an outbound IP? Should I just make a new Web App within the Service Plan? Should I make a new Service Plan?
I think it's impossible to change some setting somewhere to allow an outbound IP. For more details, pls read the offical document about Inbound and outbound IP addresses in Azure App Service.
The set of outbound IP addresses for your app changes when you scale your app between the lower tiers (Basic, Standard, and Premium) and the Premium V2 tier.
Related
I have 2 app service plans in the same Azure region running 1 app each - web frontend on one, API on the other.
I want to use access restrictions on the API to only allow access from the front end app.
I set access restriction rules using all the outgoing IP addresses associated with the frontend app (I note that these are exactly the same as the outgoing IP addresses on the API app as well) however when the frontend app tries to contact the API I get an error:
403 forbidden 'The web app you have attempted to reach has blocked your access.'
The 2 apps can communicate as normal when the access restrictions are removed.
I turned on diagnostic settings and ran a query on IP blocking by the app.
Turns out that the FE app is using an IPv6 address instead of the v4 addresses listed in the app properties.
This is because the app has a vnet integration set up connecting to a Subnet delegated to Webservice/serverfarm.
Azure does not make it obvious that using delegated subnets forces an integrated app to use IPv6 and there does not appear to be a way to discover what v6 addresses may be in use. MS forum response suggests any firewall rule for a web app attached to a delegated subnet should allow ALL IPv6 addresses (!!) as a way of working around the problem.
https://learn.microsoft.com/en-us/answers/questions/493483/why-is-my-azure-web-app-showing-an-ipv6-outbound-i.html
You can control the IP address of outbound traffic from your FE web app by using regional VNet integration together with a virtual network NAT gateway to direct traffic through a static public IP address. Regional VNet integration is available on Standard, Premium, PremiumV2 and PremiumV3 App Service plans. To learn more about this setup, see NAT gateway integration.
Once you FE web app has a static IP you can use that on the API web app restriction in an ALLOW rule.
If your requirement fits, you may also leverage Service Endpoints.
With service endpoints,to ensure inbound traffic to your API app comes only from the subnet used by your front-end web app.
With this route, you need to use VNet Integration with your front end app and service endpoints with your API app. Set service endpoints on the integration subnet used by your Front End application. This solution is fast to set up and easy as well.
-This feature works together with IP access restrictions. Service endpoints aren't compatible with remote debugging. There are some considerations you need to make, you may take a look at them here and also other combination of networking features available on App Service and related scenarios.
As a side note:
-IP-based access restriction rules only handle virtual network address ranges when your app is in an App Service Environment. If your app is in the multitenant service, you need to use service endpoints to restrict traffic to select subnets in your virtual network.
-On App Service, you could have those two separate apps in the same App Service Plan (ASP), since you pay only for ASP, saving costs.
So, you can continue to add apps to an existing plan as long as the plan has enough resources to handle the load. The apps in the same App Service plan all share the same compute resource.
I am trying to solve a problem. I have to access APIs that are hosted on my on premises server (on-prem) from Azure hosted Web API.
The problem is that my on-prem server only allows white listed IPs. I know we can get outbound IPs from our Web App (Azure hosted). But I am not sure whether they are static or will change based on scaling.
Another Solution is to create VNET and add that Web app into that VNET. But I would like someone to suggest better solutions.
There are couple of choices you have.
First, you can have a look at the possibleOutboundIpAddress of your App Service and whitelist this IPs. This however also opens up the door for IPs not really in use by your App Service.
az webapp show --resource-group <group_name> --name <app_name> --query possibleOutboundIpAddresses --output tsv
Secondly, you can put a NAT Gateway in-front of your App Service. This however requires an App Service Plan that supports virtual network integration.
Configure regional virtual network integration from within your app service.
Force all outbound traffic originating from that app to travel through the virtual network. This is done by setting WEBSITE_VNET_ROUTE_ALL=1 property in your web app configuration
Create a public IP address.
Add a NAT gateway, attach it to the subnet that contains the app service and make use of the public IP created in step 3.
If you would also like to use a static inbound IP you can find more information here
The outbound IPs for Azure App service are generally static and will not change on scaling. There are normally 4 outbound IPs and they only change if you change the SKU or there is a need at MS end to increase the capacity of their data center (rare or may never happen in near future).
I would recommend creating a VNET as that is more secure than whitelisting IPs at your on prem service. But if you want to want list the outbound IPs, I would recommend creating a wrapper for your on prem APIs in Azure and whitelist IPs for these in your on prem firewall. This will ensure that you don't have to whitelist every time you want to create an API in Azure that needs to access on prem APIs.
Unfortunately there is no straight forward way to do this in Azure for App Services, I also had this issue recently.
The only solution (for now anyway) is to add the list of outbound IPs of the App Service to your allow rules.
Just be careful with scaling between the tiers because it will change the outbound IP addresses. (https://learn.microsoft.com/en-us/azure/app-service/overview-inbound-outbound-ips#when-outbound-ips-change)
The simplest way would be to use an Azure VM with a static public IP which is used for both inbound and outbound.
Sam Cogan has a good blog post where he does go through a couple of options.
(https://samcogan.com/obtaining-a-static-outbound-ip-from-an-azure-virtual-network/)
A hybrid connection might be a solution https://learn.microsoft.com/en-us/azure/app-service/app-service-hybrid-connections? I think they are designed for accessing on premise services.
We are trying to set up office 365 to send email from our azure account.
Are our Outbound IPs shared with other azure users or not?
https://learn.microsoft.com/en-us/azure/app-service/overview-inbound-outbound-ips
To find out if the outbound IPs that are shown in the properties area of my portal are shared with other users or do I have to buy a dedicated static IP address to make sure no one else is using them.
It seems that you refer to the outbound IP of web service in Azure. Azure App Service is a multi-tenant service, except for App Service Environments. Apps that are not in an App Service environment (not in the Isolated tier) share network infrastructure with other apps. So the IP address lists used for the web app are possible to share with others.
Unless you use an Application Service Environment (ASE) you cannot guarantee that the inbound or outbound IPs will change, However, you could control when the IP address will change. The set of outbound IP addresses for your app changes when you scale your app between the lower tiers (Basic, Standard, and Premium) and the Premium V2 tier. For more references, you could see steve's answer here.
is it possible to determine each slot of an azure webapp to different ip adresses / vnets? e.g. dev-slot to the dev-vnet and prod-slot to the prod-vnet
the properties to determine outbound ip-adresses work "global" (for the whole webapp is not offering slot individual options.
Any idea how to do that (one ip / better vnet for each webapp slot) is very much appreciated!
Thank you very much!
As I know, it is not possible to determine each slot of an Azure web app to a different IP address.
Deployment slots are actually live apps with their own hostnames which is different from Azure web app hostnames. But the slots have the same IP address with Azure web app in Azure. You can use Ping utility to verify it, Ping timeout can say nothing only we can see the host from the web app or each slot in azure.
Here are the screenshots of two slots- staging and full in Azure web app service.
Actually, the IP address 13.90.143.69 is also the IP address of the Azure web app service. If you want dev-slot to the dev-vnet and prod-slot to the prod-vnet. I think it should be dev-slot linked to Azure web app service1 and prod-slot linked to Azure web service2. The service1 has a different IP address with service2.
Hope this makes sense.
Currently creating websites in Azure and was wondering if there was a way to create reserved static outbound ip addresses for those websites. I am not creating and loading the websites via virtual machines or cloud services, just directly through the Azure websites option in the Azure portal. I read that by default, a virtual ip per region for your subscription is supplied but We don't want to provide this ip address to whitelist. Can anyone please help point me in the right direction? Thanks.
This is currently not possible with Microsoft Azure.
The outbound IP will be one of the IPs in the datacenter. The list of IPs in the datacenter can be found here.
The good news is that Microsoft are planning to make this feature available soon.
Now its possible!!!
you can use App Service Environment(ASE)
App Service supports dedicated outbound IP addresses for apps deployed using the App Service Environment (ASE) feature.
For the forseeable future, apps running in the public multi-tenant service will continue to use outbound addresses from a shared address pool.
from Dedicate outbound ip
ASE is very costly :)