SQL Server Connection errors

I am receiving the following error when attempting to open a SQL Server connection in a C# console application: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was
not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) SQL Error"
1) my coworker built the project on his machine (same code) and the project works - no errors
2) I used the identical connectionstring (same code for that matter) in a server app vs. console app - no errors
3) I built the connection using project properties/settings (Properties.Settings.Default) - test the connection on the Connection Properties window - "Test connection succeeded." Use the connection in my project to open a connection -
receive error.
4) ping to server - no errors
5) I used PL/SQL developer to connect to server using same connection information - no errors
6) I installed Visual Studio 2013, built the project - receive error
I am stuck at this point. Can anyone help?
Thank-you,
Barbara Velasco

Hi Barbara,
Firstly, please make sure that the SQL Server Services are running. Other reasons could be incorrect connection string, firewall block the connection and so on. Please refer to the following article to troubleshoot this issue:
http://stopdebugging.wordpress.com/2013/12/16/error-unable-to-connect-to-the-database-a-network-related-or-instance-specific-error-occurred-while-establishing-a-connection-to-sql-server/
In addition, here are some good articles regarding troubleshoot SQL Server connectivity:
SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified:
http://blogs.msdn.com/b/sql_protocols/archive/2007/05/13/sql-network-interfaces-error-26-error-locating-server-instance-specified.aspx
http://www.aspsnippets.com/Articles/Exception---error-26---Error-Locating-Server-Instance-Specified.aspx
If you have any feedback on our support, please click
here.
Regards,
Elvis Long
TechNet Community Support

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aebgg High
MCTS Sharepoint 2010, MCAD dotnet, MCPDEA, SharePoint Lead

Hi,
According to your post, an error occurred when you connect SQL Server in SharePoint.
We can do as follows:
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2. Check whether there is <identity impersonate="true" /> under <system.web> tag in web.config.
Here are two articles for you to take a look at:
http://blogs.windwardreports.com/tomasr/2010/09/login-failed-nt-authorityanonymous-logon-integrated-securitysspi-vs-integrated-securitytrue.html
http://www.layer2solutions.com/en/community/FAQs/BDLC/Pages/How-SharePoint-BDLC-used-with-integrated-security-trusted-connection.aspx
Best Regards
Dennis Guo
TechNet Community Support

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¯\_(ツ)_/¯

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Windows XP SP3
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http://mssqlfun.com/2012/09/28/check-list-for-sql-server-connectivity-issue/
Regards,
Rohit Garg
(My Blog)
This posting is provided with no warranties and confers no rights.
Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread.

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Detail is that I have set up the printer on a Windows PC but recently changed to Mac.
Printing, scan to Computer all works fine.
Help! I have read a lot on forums but so far no solution for me!

Hi Jack6520,
Welcome to the HP Support Forums. I see that you are unable to connect to the apps and use the scan to email feature of your Photosmart 6520 printer due to a server connection error.
First off, thank you for the very detailed information, I really appreciate it.
To better assist you, would you please provide some additional information:
When you set the manual DNS servers, did you also set a manual IP address for the printer?
Have you changed routers or internet service providers recently? Have you updated the firmware on the router? If you have an ISP-provided router, do you know if they pushed out a firmware update?
Have you recently installed any new anti-virus/malware software? If so it may have blocked the ports the printer uses to communicate. I’ve included a post by VisionAiry titled “Check the Anti-Virus for Blocked Ports and Timed Scans”.
Do you have a guest network setup? Please Print a Network Configuration page. It will let you know how many networks the printer sees. A guest network will have the same name as your network with a tag about it being the guest network.
Previously did you customize the printer’s ePrint email address? I’m asking this because I might ask you to disable then enable the web services. If we have to take this step you will lose the customized ePrint email address without any ability to get it back.
What version of Mac OS X are you using? whatsmyos.com
Are there any cables other than the power cable connected to the printer?
Thank you.
Regards,
Happytohelp01
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Why am I getting this error message when trying email a PDF?Server Connection Error. Please verify that port 143 is available for connection on your machine or contact your administrator.

My Inspector for my house sent me his report via PDF that I had to access from an online link. I downloaded it but cannot forward it in an email to my insurance company who is requiring a copy. I get this error report every time:
Server Connection Error. Please verify that port 143 is available for connection on your machine or contact your administrator.
I have no idea what this means. Can someone help? I really don't want to have to print and scan this beast but I've been messing with this for 2 days now and am out of ideas.
Thanks!

I'm having the same issue. Did you resolve it?

Will someone please help me set-up Acrobat to send a PDF via webmail? Acrobat returns a message "Server Connection Error .... Port 143 unavailable"

Will someone please help me set-up Acrobat to send a PDF via webmail? Acrobat returns a message "Server Connection Error .... Port 143 unavailable"

Are you using a Microsoft or Apache web server? If so, you can submit to a server-side script, which will bypass web mail and client-side email software such as OUTLOOK.
For examples:
http://www.nk-inc.com/software/pdfemail.net/examples/

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Hi All,
Ours is a working BPC system. Today we are simply not able to connect to BPC excel or admin. When we checked the back end by logging into the server machine and running the server diagnostics, found that 'SAP Connection' is not successful. This is same message we are getting when logged on to the server machine 'ABAP server connection error". Something went wrong. Any idea to fix this particular issue without having to reinstall the BPC server program.
Have tried the below:
Checked the locks for all system communications users such as BPC_SYSADMIN, BPC_ADMIN, and BPC_USER and no locks ensured.
Any help to resolve this issue would be highly appreciated.
Thanks,
Santosh

Hi All,
Yeah the issue is resolved after we had reset the domain id that we linked to different communication purposes between ABAP and .NET systems using UJA3_WRITE_SYSUSERS program. In our case, the problem occured as we have started using the IDs that are set purely for communication between .NET and ABAP systems in the above program for accessing BPC and developing BPC objects. This apparently has caused some disruption and ABAP server connection failed.
In other words, BPC_ADMIN, BPC_SYSADMIN and BPC_USER which were created in domain as mentioned in the installation guide should not be used to access BPC front end to develop BPC related objects. I hope I understood correctly here.
-Santosh

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