This may look like a repeat of an already existing question but it isn't.
I am trying to work with an Azure-SQL database. I attempted to log in both from Visual Studio and SQL Server Management Studio and I get the following error:
Now, after some basic troubleshooting I made sure that the firewall in the server had my IP recorded, so that isn't the issue here.
Also, just for trying I did a mobile hotspot from my phone and it logged in with no issues. So for some reason my home network isn't letting me work this.
Now before I reached out to my ISP (which would be hell on earth) I did some more digging and found this: https://stackoverflow.com/a/38641107/6461236
That users suggests that the solution is to go into "SQL Server Configuration Manager" and modify port permissions. But when I attempt to find this, it's not in my PC. I have a Windows 10 PC and I have searched everywhere and I just can't find this SQL Server Configuration Manager. Check out what I get on my Computer Management window:
So the bottom line is that I have installed both Visual Studio 2017 and SQL Server Management Studio 2017 and my computer doesn't have a SQL Server Configuration Manager. After researching a bit more all that I have found is that it should be there.
What did I miss? How can I solve this pesky problem? Thanks in advance!
EDIT: Since I could log in with no issues with my phone as a hotspot and the issues only present themselves when using my home WiFi it seems that this is a problem with my home network and not with my PC or Azure. Any tips? Should a phone call to my ISP solve this?
The issue was that my network firewall was set to "max" and was therefore blocking any outbound traffic on port 1433 (which is necessary to connect to SQL Azure). The solution was to modify the router firewall to allow for communication on this port to be outbound.
Related
Its a bit strange. Until yesterday I was able to connect to all of my SQL Servers. Once I restarted my computer, a new firewall seems to have been unexpectedly added. I tried to sign in to my azure account, but I am still getting the same error.
I have had a similar problem myself in the past, and trying to configure firewall settings through SQL Server Management Studio could not solve it for me. Instead I did this:
Log into Microsoft Azure
Go to your SQL Server that you are having difficulties with
From the menu, select "Firewalls and Virtual Networks"
Select "Add Client IP"
Enter your public IP address.
There is also documentation here
I'm trying to connect to a SQL Server database that's being hosted on Azure, I'm using the server explorer to select my Azure account, then the SQL Server; I right click and select "Open in SQL Server Object Explorer" after which I'm prompted to enter the password.
I'm unable to go past this step as I've been getting this error (see screenshot) ever since creating the server. I've added my IP address to the SQL Server's firewall.
I've even tried connecting to it with my firewall off but I get the same error.
I managed to fix the problem, it turns out the network(eduroam) at my university was the problem. I don’t understand how or why they’d want to block Azure; but using a proxy or a mobile hotspot connects me immediately without any errors.
Thanks you all for trying to help.
You can open Visual Studio from within Azure Portal and you will be automatically connected to your Azure databases. Please see image below.
You need to get your IPv4 address by pulling up Command Prompt and typing in ipconfig. Then go to your azure database and configure the firewall settings. Next add a client by creating a new client name and adding the IP address you got from your computer. This will allow your computer to access your database. It also lets you create a range for your IP address which I recommend doing.
Yes folks, it's this one again.
"A connection was successfully established with the server, but then
an error occurred during the login process (provider: TCP Provider,
error: 0 - An existing connection was forcibly closed by the remote
host.)"
I'm sorry... I have Google'd this, I have read the other StackOverflow articles on this problem, and I have tried all kinds of suggestions, but nothing works.
Here's a few notes about what we're seeing.
This issue occurs occassionally in SQL Server Management Studio itself (doing any kind of database activity... getting a list of tables in a database, having a look at a Stored Procedure, etc)
It also happens in Visual Studio 2010 itself, when it is trying to get data from the servers (e.g. when creating a .dbml file, etc)
It also sometimes happens in our .Net (ASP, WPF, Silverlight) applications.
Our SQL Server 2005 & 2008 servers are all based on virtual machines in data centres around the world, and we see sometimes this error on each of them. But most of the time, they all work absolutely fine.
When the error does occur, we can just "retry" what caused the error, and then it'll work fine.
We think.. if we have an IIS Web Server in a data centre in a particular city, and it accesses a SQL Server in the same data centre, then we don't see the issue.
We think.. if we connect to the servers, and specify the UserID and Password to use, it causes this error much more frequently than if we just use Active Directory authentication.
Put all that together, and it sounds to me like some kind of network issue.
But can anyone suggest what to look for ?
This isn't a bug in our .Net applications, as even SQL Server Management Studio "trips up" with this error.
It's baffling us.
Just in case anyone else hits this issue, we finally found the solution.
Our company uses Riverbed software to compress data, when it's being passed between locations, and this was somehow causing some connections to get dropped.
Our IT gurus found a configuration setting which finally fixed this issue.
I believe there's a setting in there to turn off compressing results from SQL Server (or something like that). That fixed it for us.
It could be any number of network issues. ANYTHING that prevents the code from reaching the server even for the few miliseconds it takes to make one query.
it could also be the result of a failover. When we went from a single SQL Server to a clustered environment, we'd see this happen during a failover. In this case, it turned out to be our Connection Pooling. In essence, the SQL cluster has a controller and two servers behind it. A and B.
Say our web app is using server A just fine, Connection pooling creates a connection on both sides. The server is aware of it, and the web app is aware of it. Once the cluster fails over to the second server, the web app is aware of the connection but server B is not, so we get an error.
The point is, any possible cause of network issues imaginable may be the cause. DOS attacks on the server, man-in-the middle attacks intercepting and changing traffic. Someone trips on an ethernet cable and it's loose in the jack. You name it, if it can cause a connection issue, it could be the cause.
Your issue also sounds like one we had recently - we also have a virtual environment, wih software that moves VMs from one host to another as needed for load balancing. Every so often, we'd get bombarded with the same error. It turned out to be an issue with the NIC drivers on one of the hosts, so whenever a VM moved to that particular host, errors would occur.
It's really not a programming issue. It's an environment issue, and you need trained professionals with direct access to your environment to research and resolve this.
My problem was that I was inadvertently using a wireless network to connect to our network because the Ethernet cable was faulty. This after repairing SQL Server, running a Winsock reset as recommended elsewhere ...
I am experiencing the same issue and our app interfaces with a several Azure SQL DBs. I believe (same as you) I do not have a bug in the C# code to cause this issue. We've solved it by a simple for loop containing an extra attempts to try to connect to the Azure SQL again if the previous attempt fails and then run the query.
Most of the time everything runs fine but sometimes we can see the loop kicked-in and on the 2nd or 3rd time it executed properly without the below mentioned error. After that we see in the log file the error below for all the unsuccessful attempts:
A connection was successfully established with the server,
but then an error occurred during the login process. (provider: TCP
Provider, error: 0 - An existing connection was forcibly closed by the
remote host.)
Even though this is a less-then-pretty solution, it allowed us to run our app without interruptions. I know you've mentioned that trying to connect again (to introduce some connection-failure tolerance) solves the problem and unfortunately this is the only correct solution I found so far as well.
I should mention that we have tried many debugging strategies to figure this out. Right now it all points to the availability of the database we are trying to connect to i.e.: It happens if the number of allowed DB connections is exceeded. (or so it seems at this time)
Turn off your VPN
My Problem fixed by turn off VPN
It was happening in our code when we were opening the dbconnection for oracle and were passing DBtype as SQL in our database object.
in my case - the error was Microsoft first suggestion:
Client is connecting with an unsupported version of the SQL Server Native Client.
In our case, We got this error when we updated sql server to sp3. We were not able to connect to the database from SSIS package.
We updated the native client and configurations. We were able to connect.
link to download the native client - https://www.microsoft.com/en-us/download/confirmation.aspx?id=50402
Link for configurations settings and further troubleshooting - https://learn.microsoft.com/en-us/previous-versions/sql/sql-server-2008-r2/ms187005(v=sql.105)
Hope it helps.
Cheers!
Had the same type of issue. In my case it was a bit more complicated... I could connect to “ServerA” from “ServerB” via SSMS, but it would fail with sqlcmd. The error was the same:
Sqlcmd: Error: Microsoft SQL Server Native Client 11.0 : TCP Provider: An existing connection was forcibly closed by the remote host.
I could also connect from “ServerC” with both SSMS and sqlcmd. The following are the versions on the VMs:
ServerA: Microsoft Windows Server 2012 R2 Datacenter / Microsoft SQL Server 2012 (SP3-CU10) (KB4025925) - 11.0.6607.3 (X64)
ServerB: Microsoft Windows Server 2012 R2 Datacenter / Microsoft SQL Server 2012 - 11.0.5058.0 (X64)
ServerC: Microsoft Windows Server 2012 R2 Datacenter / Microsoft SQL Server 2012 (SP3-CU10) (KB4025925) - 11.0.6607.3 (X64)
Bottom line was the “unsupported version”. I noticed a mismatch of “sqlncli11.dll” between ServerC and ServerB, so I copied it to the System32 folder. After this, sqlcmd worked like a charm. Below were the versions in my case:
Failed:
FileVersion: 2011.0110.5058.00
ProductVersion: 11.0.5058.0
Worked:
FileVersion: 2011.0110.6607.03
ProductVersion: 11.0.6607.3
I was working on 2 projects at the same time (on 2 different machines) and both used SQL Server.
When i disconnected SQL with 1 machine the errorMessage went away. Probably you can mess around with IP-adresses too to fix the problem.
In my case I was seeing this error intermittently from a .Net application connecting to a SQL server located in the same server room. It turned out that some of the databases had auto close turned on which caused the server to close the connections in the pool. When the application tried to use one of the pool connections that had been closed, it would throw this error and I saw a log message on the SQL server that the database it was trying to connect to was being started. Auto-close has now been turned off on those databases and the error hasn't been seen since.
Also, having auto-close on is the default behavior for SQL Express databases and these were originally created on an Express instance during testing before being migrated to the production server where we were seeing the errors.
this answer is for those how have this problem with Azure Sql server database.
It happens when you reach mat pool
first remove Persist Security Info=False from connection string
second check your database plan in azure portal and increase the PTUs of your database plan.
In SSMS "Connect to Server" screen click Options, then on "Connection Properties" TAB change "Network protocol" to "Named Pipes"
Try this -
Click Start, point to All Programs, and click SQL Server Configuration Manager.
Click to expand SQL Server Network Configuration and then click Client Protocols.
Right-click the TCP/IP protocol and then click Enable.
Right-click the Named Pipes protocol and then click Enable.
Restart the SQL server service if prompted to do so.
I have had this issue a couple of time already, and I've fixed by reducing the MTU size. Often 1350, 1250, etc on my network interface.
I just setup a new Windows Server 2008 machine with an instance of SQL Server 2008 Express. The SQL Browser service does not appear to be working correctly. In Management Studio, browsing for servers shows the hostname of the new server, but not the instance name. When you choose the hostname form the list it doesn't connect. But I can connect manually by typing the hostname\instancename combination.
update 1:
The browser service is running, and I have tried it with several different accounts, including domain administrator which is a bad practice, but I tried anyway for troubleshooting purposes.
I have tried punching the appropriate holes in the firewall, and also completely turning the firewall off.
This is running on a Hyper-V, Windows Server 2008 32 bit guest, which is on a Windows Server 2008 64-bit host. I have done this before (without issues) on this same host, but with SQL 2008 Standard instead of Express.
When I browse for the server in SSMS(Express) on the SQL Server machine, it works fine and shows the whole instance name. When I browse for it on a remote machine (on the same intranet) with SSMS (standard) it just shows the host name.
update 2:
Followed the packets as suggested and found the following
The client sent the broadcast as expected and received correct responses from other SQL Servers on the same network.
The server received the broadcast but did not send a response.
Considering these results, I wonder why the host name ever appears in the client list in the first place. It shouldn't show up at all, right?
update 3:
Spent an hour and a half on the phone with Microsoft support. I learned a few things, but the problem is not yet solved. It was suggested that I try installing an instance of SQL Standard on the same machine. I did that and the new instance exhibits all the same symptoms. The hostname shows up in the browse list only once, not once for each instance.
update 4:
Stackoverflow chose an answer for me thanks to the bounty system, but this question is not answered. Today I tried moving the whole VM to a different host server - everything is exactly the same. The hostname still appears in the browse list, without the instance name.
update 5:
Confirmed that Hyper-V Integration Services are installed on the guest (SQL) server.
check that the browser service is running, it's not turned on by default.
UPDATE1: See if you can install Network Monitor/Wireshark to do a network trace on the SQL Server to see if it's receiving the broadcasts and sending responses. I think this is your best option in troubleshooting this issue. According to MSDN the service uses UDP port 1434, so this is the traffic to watch.
UPDATE2: Does the server have multiple IP's? according to this MSDN article the Windows Server 2008 firewall has issues responding to SQL Browser service broadcasts, even with rules allowing packets through.
I tend not to rely on browsing. You'll get inconsistent results because browsing sends out a broadcast udp/1434 packet and waits for responses back. However, since you are able to connect remotely via SERVERNAME\INSTANCENAME, that aspect of the SQL Browser service is working. If it wasn't, you wouldn't have been able to connect. With that said, to troubleshoot the browsing portion:
Have you tried stopping and restarting the SQL Browser Service?
Have you tried stopping and restarting the instance if that didn't work?
To completely troubleshoot this, unfortunately, you'd have to do packet traces.
Sounds like the browsing service is messed up somehow...
I don't know if you can temporarily take this SQL Server down temporarily. But if so, you may want to try this:
Uninstall all SQL\instances completely.
Run the install of SQL Express 2008
Create a default instance during install (Not a named instance)
Run the installer again and create the default named instance (SQLExpress)
Try connecting to the named instance again. If it works, you can remove the default instance.
I had the same issue in a VM. After shutting down the Firewall it worked.
I just had this same issue. I was not able to see Instance Names in the SSMS Network Servers tab. It turned out that I had set up Hyper-V and created an Internal Network on my local machine. That network was identified as a Public/Guest Network and the Windows Firewall was ENABLED for it, even though my Domain setting has the Firewall DISABLED. Once I disabled that guest network on my computer I could see all the instances.
Machines:
Physical SQL Server 2014 Ent
Windows 8.1 laptop running Hyper-V
I have a desktop, and a Laptop. The Desktop has Windows 7 64-bit and the Laptop has Vista Ultimate 32-bit. On both machines I have SQL Server 2008 Standard installed.
On the laptop, I open SQL Management Studio and try to connect to the SQL Server on the desktop. It times out.
With SQL Server Config Manager I Enabled TCP/IP and Named Pipes for the client protocols.
In SQL Management Studio, I right clicked on the Database Engine, went to properties, and allowed remote connections. I also created a sql server login named "testuser" and a password. I then added that user as a login for my database and made them the database owner.
I could not figure out how to allow connection to my db throw the windows firewall, so I turned it off.
What am I missing? I made the same changes on my laptop, and I can connect from the Desktop to the Laptop in Management Studio?
Do you have a checklist?
Thanks.
UPDATE:
I turned off antivirus. Ran NetStat -a and the listener is listening.
If your login attempt takes about 30 seconds to timeout, then it's some kind of network connectivity problem (or SQL isn't listening properly). A permissions problem would come back after a few seconds, so the long wait says it's connection-related.
If you run "NETSTAT -a" on the server, so you see SQL Server listening on port 1433? If not, then maybe the SQL TCP Listener isn't configured properly on the server - there should be events in the Windows Event log to this effect when the SQL Service starts up.
Please edit your question with the results and we can go from there.
Try using Telnet to see if the laptop can see the desktop via port 1433.
Open a command prompt on the laptop and enter:
telnet DesktopNameOrIPAddress 1433
Press Enter, and you should either see a connection failed error, or a blank screen. If you get the blank screen, the connection was established. Press CTRL-] to break out of it, then type "quit" and enter to quit.
If the connection failed, attempt to resolve the general network issue with port 1433 before bothering to use the SQL Server tools.
If you have any other anti-virus software running, it may also have a firewall built in. I know that McAfee does, for instance. Check for that.
You've probably already thought of this, but have you checked that the server is configured to allow Mixed Mode Authentication? I have not had access to 2008, but I seem to remember that at least one of the previous versions was configured to disallow sql logins by default.
I assume you already did what you have to do on the OS level. Or maybe tried to link the server to see if you can actually traverse your network. Let me suggest a quick test. Check if you can actually test connectivity by creating a Universal Data Link. In case you don't know how to do this, create a new text file in your desktop (or anywhere) and change the .txt file extension to .udl; then just open it. See if your other server is "viewable" over the network (Don't forget to change the Provider to OLE DB Provider for SQL Server).
Is the SQL Browser Service running on the server you are trying to access? (By default this is disabled, and you'll need that to access SQL Server remotely)