I have Firewall COMODO and just got a message I think I never received:
Sqlbrowser.exe is trying to receive a connection from the internet
The only difference I can say its that I am in Dial-up connection and my regular connection is DSL.
Why would my SQL (v2000) is receiving a connection from Internet and I have no recent install (maybe AVG 8.0)?
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As long as you have a single MSSQL instance running, you do not need SQL Browser service. And as already stated, it is a common attack target, so it is better to block the 1434/udp port or stop the service.
The difference between DSL and dial-in is that you are not exposed directly to the internet with DSL (the router is, in fact). With dial-in, you are exposed, and each attack is performed against your computer.
ok...couple of questions:
1. If I have just one sql instance in my PC the its correct to disable or turn off SQL Browser service?
2. SQL Browser service is when more than one instance is running in my pc....what about when i'm at my office connected to my lan, and i have to connect office sql, do i still need SQL Browser service running?
3. Last, how do I block port 1434 and how do I know that SQL Browser service is using that port?
1. yes
2. SQL Browser service is only responsible for the instances on the box it is running on. It does not need to run on client side, at most on server side.
3. port 1434/udp is defined to be the Browser port. It can be changed, but that would need to adapt each client, too, as by convention that port has to be known by all sides (obviously).
To give you a bit more information about the process:
The easiest way to turn off SQL Browser on you machine is to go into SQL Server Configuration Manager set the Start Mode to disabled on the Service Tab and then Stop the service back on the first tab (Log On).
SQL Browser Properties
If you want to stick on switching off SQL Browser service, you can used fixed ports. In MSSQL 2005 Configuration Manager, on properties of TCP connections, set a fixed port in the last available field. Use that port in each connection string, e.g.
localhost\mssql2005,12345
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by: CGLuttrellPosted on 2009-04-10 at 21:14:54ID: 24120853
In general we do not have SQL Server Browser running on any box exposed to the internet. It has been a security risk in the past as malicous hackers commonly scan the web for responses from this request to see what databases they can try to attack.
The bellow is from 2005 BOL which explains what the Browser service is. It replace a similar service in 2000.
"SQL Server Browser runs as a Windows service on the server. SQL Server Browser listens for incoming requests for SQL Server resources and provides information about SQL Server instances that are installed on the computer. SQL Server Browser contributes to three actions:
*Browsing a list of available servers
*Connecting to the correct server instance
*Connecting to Dedicated Administrator Connection (DAC) endpoints
For each instance of the Database Engine, the SQL Server Browser service (sqlbrowser) provides the instance name and the version number."
See full article at http://msdn.microsoft.com/
HTH