The problem I have is that we're trying to use our WebApp in Microsoft Azure to connect to an external SQL-database (not our own) through a VPN. The SQL-database is only allowing connections from our local IP-addresses that we put up as a Network (for example 176.0.0.0/24).
We are now connected to the same virtual private network, and through our Azure-VM we can now connect to the SQL-Server through SQL Server Management Studio.
Now we want to do the same with a WebApp, but we're not getting through to the server. It gets "Not authenticated" before reaching the SQL-Server (probably the server isn't accepting our IP from the WebApp).
The different problems I have tried to look through is:
Do we only try to connect through our Outbound IPs?
Is the WebApp not connected to the VPN?
I have unfortunatley not found any real answers, and neither any solutions to my problem. If you have any ideas of how to solve our problem, or maybe know how I could tunnel all of the SQL-calls through the VM, the help would be very much appreciated!
Hybrid connection is one option. What you can also do is enable point-to-site in your VPN. Once you do that, you can directly integrate your web app to the vnet and your connections will work. (Go to your web app -> Settings -> Networking -> VNet Integration)
If your Vnet is V1(older way of creating VNs) then enabling point to site is very straightforward. You can do it through portal. For V2 Vnets you have to do it through powershell commands.
Here is a link for the documentation which explains both the options.
https://azure.microsoft.com/en-in/documentation/articles/web-sites-integrate-with-vnet/
There's a way to "tunnel all of the SQL-calls through the VM". You may want to use hybrid connections (cf https://azure.microsoft.com/en-us/documentation/articles/integration-hybrid-connection-overview/).
The principle is to have an agent installed on the VM that can access the database with the correct IP address.
Suppose you can access the SQL DB as mysqldbsrv from the VM. You add an hybrid connection associated to your web app, you install the agent on the VM. Then, when you connect to mysqldbsrv from the Web App, you go through the VM.
Related
I have a Web App (Azure App Service) and I have an Azure SQL Database that this Web App talks to. I have two questions regarding communication between the two.
When connecting from the Web App to the Database (using the connection string), does the communication go out to the internet and then back into Azure or does Azure know to keep the traffic locally in Azure?
I have been looking into V-Net Service Endpoints as a possible way to improve speed of communication between the two. It is said that when connecting from a VM on V-Net with Service Endpoints enabled to a SQL Database, that Azure knows to keep the traffic internal to the Azure network and not go out to the internet, is this the same for Azure App Services?
Is it possible to keep traffic between an App Service and SQL Database internal to Azure? If so, how do I go about doing this? Any guidance on this is greatly appreciated.
It knows to keep it local on the "Azure backbone" (as per Azure doco). It doesn't go out to the public internet
Yes
Yes. It is already internal to the "Azure Backbone"
Having said that.... networks are really complicated.
As I understand it the main benefit of V-Net is that you can define your own network and add things to it like firewalls, security groups, subnets, peering between networks. Also it helps when setting up a hybrid network - i.e. connecting Azure resources to an on-premises network. When you can set up the same kind of structures as on premise, it's easier to 'transparently' make it part of the on-premises network. Lastly (rereading the doco), you can remove any incoming public IP firewall rules. These are "Azure backbone" IP addresses but they are also "public internet" addresses
There may be a performance improvement if the App Service and Azure SQL are on the same V-Net.
Azure SQL service endpoints are a bit mysterious. They "connect" to the VNET but you still need to connect to a public address. They don't actually take a up a local IP adress.
Depending on what you are really doing, you might want to look into private endpoint, which actually assigns a private IP to your Azure SQL.
Yes, communication between Azure App Service and Azure SQL Database is "local" within the Azure Virtual Network and does not go out to the public internet.
Hi i am new to Web Services. Here is my doubt
1) If i am hosting my website then their should be a web server which should keep my website into that this also we are calling server..
2) If i want to run PHP Program in my local system i should use Local Server lie XAMPP this also we are calling server.
My doubt is for example in local system i have downloaded Xampp and i am running my server side program.. but after uploading into server how its working
also AWS, Proxy is which server???
All the servers are confusing a lot
Both web servers and local servers are just computers with software installed on them.
Not much more.
That said a web server is a computer that is connected to the internet and has some kind of a web server software installed on it.
The most common one is an HTTP server software that can serve web pages.
For example, Apache, Nginx are both HTTP servers that can serve both static and dynamic web pages to browser across the world.
Another web server can be FTP, IRC, NTP, SMTP/IMAP/POP3 (mail servers) are all web servers that just have different software installed on them and so they serve other purposes.
A local server is again a computer that serves a client within the local network or LAN.
That means that in most cases it will not be connected to the internet or if it does it will be protected with a password so not everybody can access its services.
It can act as a file server or LDAP server that are roles of a typical local server but it can also be a local web server that holds web-based application only for the local organization.
For example, a company will have a local web server with Salesforce installed on it to serve it's CRM needs.
To make a long story short both servers are just computers connected to a network. Local servers are connected to the LAN and Web Servers are connected to the WAN. Other than that it really depends on the software you install on them and the use you want to make of them.
If you need more clarification, leave a comment and I'll try to help.
I have a set up I would like to implement but just not sure on the details. As you can see in the image below I have a single VPS in the web which I would like to use as a gateway to a number of locally running web servers. Im using the VPN to hide the IP/location of the server farm while maintaining the ability to host locally.
What I am not sure on is the implementation as I have never used a VPN before. My understanding is that I can host the VPN server on the server farm, have the VPS connect to it which will give me another 'local' network interface which I can then use apache to proxy traffic through?
The server farm is basically a small Kubernetes cluster give or take a little.
Is my understanding correct and can you offer any advice on implementaion?
Thanks in advance!
server farm example image
The VPN server should have two network interfaces. The first is the public interface that connects to the Internet and the second is the local interface that connects to the server farm. All the servers in the farm should connect only to the local interface and have the gateway set as the VPN server.
You can use the Reverse Proxy functionality in Apache to route incoming traffic to the appropriate server. See Reverse Proxy Guide
I am trying to use Azure Files and I am getting the following System error 53. Any ideas?
There are two possible reasons for getting this error if you are trying to mount your Azure file shares from outside of Azure Datacenter via SMB 3.0.
Your client OS needs support SMB 3.0, for example use Windows 8, Windows 10, Windows Server 2012.
The port 445 (TCP Outbound) needs to be opened by your ISP or firewall. The SMB protocol is dependent on this port if you mount from outside of Azure Datacenter, and I do notice some ISP blocked this port (e.g. Comcast).
You can refer to the links below to do a self-check on the port by yourself.
http://poshcode.org/2514
http://powershell.com/cs/media/p/4063.aspx
There is another explanation for this error.
If you try to connect to that network share from your machine as opposed to connecting from an Azure VM (or role).
The network share is only visible to Azure VMs. There may even be one more restriction - the share and the VM must live in the same Azure region.
Sources:
My experience, hitting this problem on my laptop (and seeing it work, using the same cmd, in an Azure VM).
Also, this: https://blogs.msdn.microsoft.com/windowsazurestorage/2014/05/12/introducing-microsoft-azure-file-service/ :
Once your share is created, it can be accessed via the SMB or REST
protocol from any Azure node (VM/Worker/Web role) hosted in the same
region as the storage account hosting the share.
This is the only thing that worked for me:
Change this registry key to a value of 3
HKLM\SYSTEM\CurrentControlSet\Control\Lsa > LmCompatibilityLevel
For more information, see the LmCompatibilityLevel topic on TechNet.
Got this solution from this MS docs
This is my Azure configuration:
I have a Virtual Network with a couple of subnets and a gateway
configured to allow point-to-site.
There is one Virtual Machine with SQL Server (2014) installed. There
are some databases in there already. SQL Server is set up to allow
SQL Server and Windows Authentication mode. This VM is in the Virtual Network
I have an empty Azure Web App
I deployed my main MVC WebApp to the empty Azure Web App and looks good, except when it tries to retrieve information from the database.
Is it a connection string error? or there can be something else...
My connection string looks like this:
<add name="MyEntities" connectionString="metadata=res://*/Data.MyModel.csdl| res://*/Data.MyModel.ssdl| res://*/Data.MyModel.msl;provider=System.Data.SqlClient;
provider connection string="
data source=tcp:10.0.1.4;
initial catalog=MyDataBase;
persist security info=False;
user id=MySystemAdmin;
password=SystemAdminPassword;
multipleactiveresultsets=True;
App=EntityFramework""
providerName="System.Data.EntityClient" />
Here is the error thrown by the azure web app...
So it seems to be related to either the way I'm providing the connection string or the end-points/firewall configuration.
Check your connection string against this connection string for Entity Framework designer files (https://msdn.microsoft.com/en-us/data/jj556606.aspx#Connection)
Just from a quick glance I see two possible errors:
Semicolon missing added after provider=System.Data.SqlClient (the example on the page I provided the link to doesn't have one)
The IP address you specify to connect to is a local one (10.0.0.1) and should be the IP/DNS name of your database in Azure.
Not sure if this is the issue or if StackOverflow just clobbered your markup. In addition you talk about a lot of gateways so I would check to make sure you can talk between your systems. Finally posting error messages and capturing exceptions about what's actually going on will help diagnose the error because at this point it's all guesswork.
Hope that helps.
What the guys said above plus:
The Web App needs to have a hybrid connection to the VNET the VM is if you want to use the local IP address, otherwise you have to use the PIP.
Check the firewall on the VM if the proper ports are open. This has to be both on the VM firewall and the endpoints. Also, if there are any ACLs on the VM, you have to check those too.
The other answers gave me the guidelines to find out the solution.
I'll try to describe the steps I followed:
Using the new azure portal (portal.azure.com currently in preview) I
established a connection between the Azure Web App and the Virtual
network:
Home > Browse > Click on Azure Web App name
In the Azure Web App blade click on Networking tile
In Virtual Network blade, click on the Virtual Network where the database is located (it's important to mention that the Virtual Network ought to have a gateway previously configured)
My intention was to provide certain level of security to the VM with
the databases by placing it inside a Virtual Network, so I had not
considered opening ports. Turns out that it's necessary, so, in the VM:
I enabled the TCP/IP protocol for SQL Server using the Sql Server Configuration Manager (How to? here)
Then I created a new Inbound Rule opening the 1433 port, but only for private connections (very nice).
It was not necessary to create an endpoint in the VM for this port (very happy with this).
Finally, I published the the app to the Azure Web App using the connection strings as shown in the question (with internal database IP)
Final touch: in the new Azure Portal > Azure Web App > Settings, I was able to enter Connection Strings. Settings created in the portal are not overwritten; so now I'm sure this Azure Web App will always use the correct connection string.
Final note: in theory (not tested yet) the internal IP will not change as long as the VM is not Stopped (Deallocated).