Instance Failure (System.Data) after configuring hostname alias

• daigia_dzadzich

  SSC Veteran

  Points: 283

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  October 30, 2014 at 12:34 pm

  #291995

  Hi,

  I have configured hostname aliases for 3 different instances (2 2008r2 & 1 2012) on the same physical server. After configuring, ON THE SERVER, i'm able to connect to all instances using either virtual hostname alias or physical-hostname\instance. However, when i'm sitting at my desk or some other computers, i'm unable to connect to only hostname\instance of sql2012.

  Here is the error when connecting through SSMS:

  Cannot connect to servername\instance. Instance failure. (System.Data).

  Any helps/ideas are appreciated.

  Thanks in advance,

  -Chris

• daigia_dzadzich

  SSC Veteran

  Points: 283

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  November 4, 2014 at 2:37 pm

  #1756618

  Any ideas/responses? The issue is still standing & so sporadic, so i can't deploy the configuration to production 🙁

• patilmah

  Grasshopper

  Points: 11

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  October 6, 2019 at 10:18 am

  #3686313

  Open Sql Server Configuration Manager

  Click on SQL Server Network Configuration and select Protocols for 'Instance name '.

  Right-click on TCP/IP -> Properties

  Change the port from 1433 to 1434.

  Restart sql server and it should work.