?
Solved

Can not connect to a SQL instance on over the network

Posted on 2014-12-10
7
Medium Priority
?
119 Views
Last Modified: 2014-12-17
Hi,

I am struggling to connect to a SQL instance from SQL management Studio installed on another server. I have been able to do so until recently and it is not clear what may have caused this. Here are the symptoms:

When i try to connect to Server\Instance using SQL management studio, i get "a network related or instance specific error has occured...."

But

When i connect to Server\      (no instance, i.e. default uinstance) it connects no problem.

The server names resolve correctly from both sides and all protocols are enabled in SQL config on both sides.

Port 1433 is open. (1434 is not used in this environment).

Any help would be greatly appreciated.

Thanks

m
0
Comment
Question by:mk112233
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
  • +1
7 Comments
 
LVL 51

Expert Comment

by:Vitor Montalvão
ID: 40491298
What about SQL Server Browser? Is it running in the target server?
0
 
LVL 35

Expert Comment

by:ste5an
ID: 40491349
Cause "Server\" works, I guess it's the default instance. So "Server\Instance" is a different instance on the same machine. Here I would guess it's not configured to accept remote connections.

See How to enable remote connections in SQL Server 2008?
0
 

Expert Comment

by:rossgroupdba
ID: 40491434
w/o explicitly supplying the port# of the named instance the SQL driver needs to communicate with the SQLBrowser service on the remote computer to ask for the port# of the requested instance.  SQLBrowser I believe generally runs on port 1434.  When asking to connect to the default instance  the driver 1st attempts on 1433 then I believe will then ask the SQLBrowser unless of course you supply the port#(non-default) of the default instance.

Are there multiple instances?  
Either turn on SQLBrowser  
OR
Check SQL cfg mgr find out the dynamic or fixed port of the named instance
connect in SSMS via <Server>\<Instance>,<port>  if that works and you dont want to use SQLBrowser then I would suggest altering the port to be fixed or next time the instance cycles you will have to lather rinse repeat.
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 

Author Comment

by:mk112233
ID: 40493347
SQL Browser service is running on both servers. The instance is running on port 1433 only according to CQL config on the destination server.
0
 

Author Comment

by:mk112233
ID: 40493362
port 1433 is definitely open from the source to destination
0
 
LVL 51

Accepted Solution

by:
Vitor Montalvão earned 1500 total points
ID: 40493480
The instance is running on port 1433 only according to CQL config on the destination server.
This is the default port for the default instance. A named instance should have another port number.
0
 

Expert Comment

by:rossgroupdba
ID: 40494613
Are you trying to connect to the default instance or a named instance?
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Use of TCL script on Cisco devices:  - create file and merge it with running configuration to apply configuration changes
In this article, we’ll look at how to deploy ProxySQL.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question