2005: cannot to connect from .NET

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  • RAM
    #1

    2005: cannot to connect from .NET

    Hello,
    Could you help me please to solve the prblem with connecting to SQL Server
    from .NET development environment?
    I have the following error:

    "An error has occured while establishing a connection to the server. When
    connecting to SQL Server 2005, this failure may be caused by the fact that
    under the default setting SQL Server does not allow remote connections.
    (provider: Named Pipes Provider, error: 40 - Could nott open a connection to
    SQL Server)

    Please help. I changed option for remote connections but it doesn't help.
    /RAM/


    Tags: None
    • Erland Sommarskog
      #2
      Re: 2005: cannot to connect from .NET

      RAM (r_ahimsa_m@poc zta.onet.pl) writes:
      Could you help me please to solve the prblem with connecting to SQL Server
      from .NET development environment?
      I have the following error:
      >
      "An error has occured while establishing a connection to the server.
      When connecting to SQL Server 2005, this failure may be caused by the
      fact that under the default setting SQL Server does not allow remote
      connections. (provider: Named Pipes Provider, error: 40 - Could nott
      open a connection to SQL Server)
      >
      Please help. I changed option for remote connections but it doesn't help.
      Does the server accept connection from Named Pipes? Check this in
      the SQL Server Configuration Manager.

      Have you tried to connect over TCP/IP.

      Also check firewalls etc.


      --
      Erland Sommarskog, SQL Server MVP, esquel@sommarsk og.se

      Books Online for SQL Server 2005 at
      http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx

      Books Online for SQL Server 2000 at
      http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx

        Comment

        • RAM
          #3
          Re: 2005: cannot to connect from .NET

          Does the server accept connection from Named Pipes? Check this in
          the SQL Server Configuration Manager.
          Yes
          Have you tried to connect over TCP/IP.
          I am configuring data source. The message is displayed in Visual Web
          Developer, the problem is not in source code.


            Comment

            • Erland Sommarskog
              #4
              Re: 2005: cannot to connect from .NET

              RAM (r_ahimsa_m@poc zta.onet.pl) writes:
              >Does the server accept connection from Named Pipes? Check this in
              >the SQL Server Configuration Manager.
              >
              Yes
              And client and server agree on the name of the pipe?
              >Have you tried to connect over TCP/IP.
              >
              I am configuring data source. The message is displayed in Visual Web
              Developer, the problem is not in source code.
              Eh? Whether you configure a data source, have a program, or connect from
              a tool like SSMS has nothing do with it. You can still set up the connection
              to use TCP/IP. Usually TCP/IP is preferrable over named pipes.

              Sorry, but I can't help more, because know next to nothing about your
              machines. Are client and server on the same machine or different? Is the
              instance a named instance or a default instance?

              Did you check that the SQL Server Browser service is running and accepts
              remote connections?

              --
              Erland Sommarskog, SQL Server MVP, esquel@sommarsk og.se

              Books Online for SQL Server 2005 at
              http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx

              Books Online for SQL Server 2000 at
              http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx

                Comment

                • RAM
                  #5
                  Re: 2005: cannot to connect from .NET

                  I have noticed something interesting.
                  The problem occurs when I am configuring data source control. The connection
                  string is taken from web.config:
                  <add name="MIMMagazy nDemo" connectionStrin g="Data Source=localhos t;Initial
                  Catalog=MIMMaga zynDemo;Integra ted Security=True"
                  providerName="S ystem.Data.SqlC lient" />

                  I have noticed that the problem do not exist when I change localhost to
                  PC\SQLEXPRESS (PC is name of my computer).

                  Could you explain me why? Thank you!

                  /RAM/




                    Comment

                    • Erland Sommarskog
                      #6
                      Re: 2005: cannot to connect from .NET

                      RAM (r_ahimsa_m@poc zta.onet.pl) writes:
                      I have noticed something interesting.
                      The problem occurs when I am configuring data source control. The
                      connection string is taken from web.config:
                      ><add name="MIMMagazy nDemo" connectionStrin g="Data Source=localhos t;Initial
                      Catalog=MIMMaga zynDemo;Integra ted Security=True"
                      providerName="S ystem.Data.SqlC lient" />
                      >
                      I have noticed that the problem do not exist when I change localhost to
                      PC\SQLEXPRESS (PC is name of my computer).
                      >
                      Could you explain me why? Thank you!
                      SQL Server permits you to install several instances on the same machine.
                      One of these instances can be a default instances, all other instances
                      must be named.

                      When you refer to a default instance, you refer only to the machine name,
                      or, if you are on the machine itself, you can use ".", "localhost" or
                      "(local)" instead.

                      When you refer to a named instance, you must also include the instance
                      name separated from the machine name with a backslash, for instance
                      MYSERVER\MY2NDI NSTANCE.

                      By default, SQL Server Express is installed as a named instance as
                      SQLEXPRESS, and thus "localhost" alone will not work on a machine that
                      only has SQL Express.

                      --
                      Erland Sommarskog, SQL Server MVP, esquel@sommarsk og.se

                      Books Online for SQL Server 2005 at
                      http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx

                      Books Online for SQL Server 2000 at
                      http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx

                        Comment

                        • RAM
                          #7
                          thank you

                          Thank you very much

                          Uzytkownik "Erland Sommarskog" <esquel@sommars kog.senapisal w wiadomosci
                          news:Xns98189D2 68B5C9Yazorman@ 127.0.0.1...
                          RAM (r_ahimsa_m@poc zta.onet.pl) writes:
                          >I have noticed something interesting.
                          >The problem occurs when I am configuring data source control. The
                          >connection string is taken from web.config:
                          >><add name="MIMMagazy nDemo" connectionStrin g="Data Source=localhos t;Initial
                          >Catalog=MIMMag azynDemo;Integr ated Security=True"
                          >providerName=" System.Data.Sql Client" />
                          >>
                          >I have noticed that the problem do not exist when I change localhost to
                          >PC\SQLEXPRES S (PC is name of my computer).
                          >>
                          >Could you explain me why? Thank you!
                          >
                          SQL Server permits you to install several instances on the same machine.
                          One of these instances can be a default instances, all other instances
                          must be named.
                          >
                          When you refer to a default instance, you refer only to the machine name,
                          or, if you are on the machine itself, you can use ".", "localhost" or
                          "(local)" instead.
                          >
                          When you refer to a named instance, you must also include the instance
                          name separated from the machine name with a backslash, for instance
                          MYSERVER\MY2NDI NSTANCE.
                          >
                          By default, SQL Server Express is installed as a named instance as
                          SQLEXPRESS, and thus "localhost" alone will not work on a machine that
                          only has SQL Express.
                          >
                          --
                          Erland Sommarskog, SQL Server MVP, esquel@sommarsk og.se
                          >
                          Books Online for SQL Server 2005 at
                          http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx

                          Books Online for SQL Server 2000 at
                          http://www.microsoft.com/sql/prodinf...ons/books.mspx

                            Comment

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