I have configured an Azure VPN point to site connection to access my azure resources prtected by VNet from my local machine. I was able to access all other resources except Azure Search Service using VPN. For all the resoucres I added the GatewaySubnet under "Selected Networks" of Networking settings and also mentioned the corresponding resource's IP address as additional route in VNet Gateway.
But for azure search service I cannot add the GatewaySubnet under selected networks because search service allows only public IP address range to be added when selecting "Selected Networks".
I am getting below error when connecting to search service with VPN connected
A connection attempt failed because the connected party did not
properly respond after a period of time, or established connection
failed because connected host has failed to respond.
System.Private.CoreLib: A connection attempt failed because the
connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Am I missing any setting? Can someone help me on this?
You don't need to add anything in the Azure Search Firewall, if you got "Selected Networks" as your firewall setting, it means that you have not yet created a private enpoint for Search, if your main goal is to connect privately from On premise to Search then this will be your first step.
https://learn.microsoft.com/en-us/azure/search/service-create-private-endpoint
After the private endpoint is created, make sure that your clients know how to resolve xxxx.search.windows.net to the private IP of the newly created private endpoint, once that's done, it would all be a matter of ensuring that the routing is setup correctly and your clients should then be able to connect.
At this time, the only way to access the search service privately is through private endpoint, as mentioned in this doc.
To create a private endpoint attached to the virtual network where the local machine VPN is part of. When you connect through VPN, the machine that you're connecting from would acquire a private IP from the virtual network.
-summarized the answer from comments.
I was missing setting up the DNS forwarder. The public addresses are returned by Azure public DNS. The private addresses are returned by DNS internal to Azure. This means that we want to use DNS internal to Azure when accessing resources over a VPN connection. And this internal DNS provided by Azure is outside of our VNet and so we have to explicitly forward that using our own DNS forwarder.
We must add a DNS server to the VNet if we want DNS support for P2S or S2S connections. We must stand up our own DNS Server, actually a forwarder, and add it to the VNG DNS server list. Azure does not provide any DNS server that is addressable from the VPN connection.
We used azure firewall as a DNS forwarder and now everything works with VPN connected.
Related
I am trying to access resources that are secured behind private endpoint from a remote location using an Azure VPN Point-to-Site connection.
So far I have setup a conditional forwarder to send DNS requests to Azure's internal DNS IP address (168.63.129.16). With my setup I can resolve all my private endpoints using nslookup to their private IP addresses. I can also connect to services such as SQL server from my local machine (using SQL Server Management Studio in the case of SQL server).
The problem I am facing is that I can only access resources if I use a desktop client for a given service. If I try to do anything using the Azure Portal, I get an error stating that I cannot access resources using my Public IP address without adding it as an inbound IP address. Whilst this is certainly an option, I don't want to go down this road.
I am hoping there is an option where I can connect to private endpoint resources from Azure Portal whilst connected to my point-to-site VPN. Any ideas?
So far I have setup a conditional forwarder to send DNS requests toAzure's internal DNS IP address (168.63.129.16). With my setup I can resolve all my private endpoints using nslookup to their private IP addresses. I can also connect to services such as SQL server from my local machine (using SQL Server Management Studio in the case of SQL server.
AfAIK, the process which you are doing is correct, To fix this issue try to update the local host file on client desktop to deploy a recourse with private endpoint please refer this link for more in detail
By default when you create a Private Endpoint in the Azure Portal it will automatically lock out public access. Service Endpoints operate by adding routes to allow traffic out of the virtual network to reach the public endpoint of the service selected. If you are access resources error, update firewall rules to communicate with your Azure resources you really need to configure v-net traffic on the firewall settings
Next option is conditional forwarder, in your scenario the ble from every v-net, its public ip it won't overlap with any private ips, it available from inside of azure v-net unique to each
In conditional for forwarder, client asks the ip of a host like www.seraltos.com .The dns server looks to see the answer if knows, if not a lookup will done based on root servers or forwarder to find the ip address returns that to the client
For more information in detail, please refer below links:
Private Endpoints and DNS in Azure & Cannot access my own public IP
https://learn.microsoft.com/en-us/azure/storage/common/storage-private-endpoints
https://learn.microsoft.com/en-us/azure/private-link/manage-private-endpoint?tabs=manage-private-link-powershell
I have an Azure logical SQL server to which I added a Private Link, the NIC is attached to an existing vnet\subnet. Our company's VPN is linked to that vnet and I can see other devices on the private link's subnet but not the SQL Server.
The SQL Server is reachable on the public URL (temporarily for testing) but trying to ping or tracert the server with the private IP fails, I can ping and tracert to other VMs on the same subnet.
I'm not using a custom DNS zone because it's imperative that we configure it with the IP and I haven't made any changes to our company DNS (I'm expecting not to have to).
Other than creating the private link and attaching it to the SQL Server, what else needs to be done? What am I missing?
I'am working on the same Issue. It's still not solved yet but there are some steps you need to do.
For the Connectivity it's required to add a DNS, especially if you want to connect from the On-Prem. Azure has a default DNS-Solution for Azure-Resources. The Problem is: From On-Prem you can't access the default Azure-DNS-Service.
So you have to configure a DNS-Zone (in Azure or On-Prem).
I'm experiencing some deeply frustrating issues when trying to connect to a SQL server Private Endpoint. Setting aside for a moment a complete specification of the problem, I'd like answers to the following questions
Is it the case that a SQL Server Private Endpoint will only listen to connections from an Azure Virtual Machine? I have seen it suggested by 3rd parties that this is the case but cannot find this explicitly documented by MS. (To clarify, if only VMs can connect, then this would mean, for example, that an Azure Load Balancer could not use Private Endpoint as a backend resource; and, for example, that an on-premise VM could not connect to a Private Endpoint through a VPN - is that correct?)
Presuming the answer to the above question is Yes, then does the restriction apply such as to prevent Private Endpoint from listening to connections forwarded from an Azure VM interface?
(For example, say a firewall in a VM in Azure. Inside the firewall VM, the IP 192.168.0.10 is configured. In Azure, the VM interface is associated with only a single IP address which is IP 192.168.0.6. In this scenario, the firewall VM will respond to ARP requests with ARP responses saying "I have 192.168.0.10", but 192.168.0.10 is not associated by Azure configuration with any Azure virtual network interface. In said case, will a connection to the Private Endpoint using source address 192.168.0.10 work? Or is it the case that the PE will listen for connections only with a source address 192.168.0.6?)
To answer your questions:
It's possible that use a private endpoint as backends in the Azure Load balancer because Azure LB supports NIC or IP address as the backend target. Also, the on-premise VM surely can connect to a private endpoint through VPN tunneling, read this document for more details.
A VM by default sends all outbound traffic to the IP address that's assigned to the primary IP configuration of the primary network interface. So it will use source address 192.168.0.6 when connecting to the private endpoint. Read the network interface constraints.
Here a Data engineer who needs your help to setup a connection to an on-premise environment :)!
I have created a virtual network (10.0.0.0/16) with a default subnet (10.0.0.0/24).
Then I created a (Windows) virtual machine which is connected to the vnet/subnet and has allowed ICMP inbound and outbound rules for the ping test. Ping google.com is no problem.
The next step was to create a Virtual network gateway & Local network gateway to connect to an on-premise environment.
The Local network gateway has an Site-to-site (IPsec) connection to a VPN device from a third party (over which I have no control). Status in the Azure portal = 'Connected'.
The third party is able to ping the Virtual Machine in Azure, the 'data in' property on the VPN connection shows that 2 kb (ping) has been received. So that works!
When i try to send a ping command to the ip-address (within the 'address space' specified from the Local network gateway) the ping command fails (Request timed out.).
After a lot of searching on google/stackoverflow I found out that I need to configure a Route Table in Azure because of the BGP = disabled setting. So hopefully I did a good job configure the Routing Table Routes but still I can't perform a successful ping :(!
Do you guys/girls know which step/configuration I have forgotten or where I made a mistake?
I would like to understand why I cannot perform a successful ping to the on-premise environment. If you need more information, please let me know
Site-to-site (IPsec) connection screenshot/config
Routing Table setup screenshot/config
Routing Table Routes in more detail
If you are NOT using BGP between the Azure VPN gateway and this particular network, you must provide a list of valid address prefixes for the Address space in your local network gateway. The address prefixes you specify are the prefixes located on your on-premises network.
In this case, it looks like you have added the address prefixes. Make sure that the ranges you specify here do not overlap with ranges of other networks that you want to connect to. Azure will route the address range that you specify to the on-premises VPN device IP address. There are no other operations that we can do. We don't need to set UDR, especially we don't associate a route table to the Gateway Subnet. Also, avoid associating a network security group (NSG) to the Gateway Subnet. You can check the route table by selecting Effective routes for a network interface in Azure VM. Read more details here.
If you would like to verify the connection from Azure VNet to an on-premise network, ensure that you PING a real private IP address from your on-premise network(I mean the IP address is assigned to an on-premise machine), you can check the IP address with ipconfig/all in local CMD. Moreover, you could Enable ICMP through the Windows firewall inside the Azure VM with the PowerShell command New-NetFirewallRule –DisplayName "Allow ICMPv4-In" –Protocol ICMPv4. Or, instead of using PING, you can use the PowerShell command Test-NetConnection to test a connection to a remote host.
If the problem persists, you could try to reset the Azure VPN gateway and reset the tunnel from the on-premises VPN device. To go further, you could follow these steps to identify the cause of the problem.
I have SQL Azure Database Server (not managed instance). When setup last year, I added Azure Virtual Network Gateway, and I could access the database via the VPN connection, without whitelisting the IP.
We didn't use this connection via gateway since Jan 2020. There was only couple of developers connection but had their IP whitelisted.
Recently, we tried accessing the database using this connection, and it doesn't work. Prompting to whitelist the IP. Has something changed?
It seems that you just enable Azure virtual network service endpoints for your Azure SQL database server (not managed instance) and add this subnet to your SQL network rules. With service endpoint, the traffics go over the Internet but restrict over the network. Service endpoints and Private endpoints are two different things.
To connect to your Azure SQL database via a VPN connection, you could use a private link. Private Link allows you to connect to various PaaS services in Azure via a private endpoint. You could get the detailed steps from https://learn.microsoft.com/en-us/azure/azure-sql/database/private-endpoint-overview
Alternatively, you could try to use a TCP proxy server to forward traffic to the public IP address for SQL Database. Reference: https://argonsys.com/microsoft-cloud/library/using-a-tcp-proxy-to-connect-to-sql-database-over-vpn/