https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906414#M1227486 <P><a href="https://community.qlik.com/t5/user/viewprofilepage/user-id/151896">@sillaak1</a></P><P>&nbsp;</P><P>What Qlik product are you using?&nbsp;</P> Thu, 17 Mar 2022 09:36:57 GMT Maria_Halley 2022-03-17T09:36:57Z https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906285#M1227483 <DIV class="modal moreDetailsPopup fade ng-scope ng-isolate-scope in" tabindex="-1" role="dialog"> <DIV id="att-modal-div" tabindex="-1" role="dialog"> <DIV class="modal-dialog"> <DIV class="modal-content"> <DIV class="modal-body ng-scope"> <DIV class="includedModalTpl ng-scope"> <DIV class="ng-scope"> <UL class="moreDetailsMessageList"> <LI class="ng-scope firstMsgItem"><SPAN class="ng-binding">SYS-E-HTTPFAIL, Cannot connect to SQL Server.</SPAN></LI> <!-- end ngRepeat: message in vm track by $index --> <LI class="ng-scope secondMsgItem"><SPAN class="ng-binding">SYS,GENERAL_EXCEPTION,Cannot connect to SQL Server,RetCode: SQL_ERROR SqlState: 08001 NativeError: 53 Message: [Microsoft][SQL Server Native Client 11.0]Named Pipes Provider: Could not open a connection to SQL Server [53].</SPAN></LI> </UL> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> Mon, 26 Jan 2026 21:26:37 GMT https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906285#M1227483 sillaak1 2026-01-26T21:26:37Z https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906414#M1227486 <P><a href="https://community.qlik.com/t5/user/viewprofilepage/user-id/151896">@sillaak1</a></P><P>&nbsp;</P><P>What Qlik product are you using?&nbsp;</P> Thu, 17 Mar 2022 09:36:57 GMT https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906414#M1227486 Maria_Halley 2022-03-17T09:36:57Z https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906546#M1227488 <P>This is an error is due to Qlik not being able to connect to the SQL server.</P> <P>Has this ever worked or do other Qlik apps connect to this server OK?&nbsp;<BR />Is the SQL server name &amp; instance correct?<BR />Are the ports used by SQL blocked by your firewall, usually port 1443?<BR />Is named pipes configured on your SQL Server?</P> Thu, 17 Mar 2022 13:54:31 GMT https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906546#M1227488 Colin-Albert 2022-03-17T13:54:31Z https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906558#M1227489 <P>Hi&nbsp;<a href="https://community.qlik.com/t5/user/viewprofilepage/user-id/151896">@sillaak1</a>&nbsp;<BR />The error&nbsp;<SPAN><EM>[Microsoft][SQL Server Native Client 11.0]Named Pipes Provider: Could not open a connection to SQL Server [53]</EM>&nbsp; is returned&nbsp;in Qlik logs as that is what the product is receiving from the source. So this is not a Qlik error, per se.&nbsp; As Collin stated, Qlik cannot connect to the SQL server.</SPAN></P> <P>I did a Google search on the error and the below URLs were returned which may assist you:</P> <UL> <LI><A href="https://techyaz.com/sql-server/troubleshooting/fix-error-53-not-open-connection-sql-server/" target="_blank" rel="noopener">https://techyaz.com/sql-server/troubleshooting/fix-error-53-not-open-connection-sql-server/</A></LI> <LI><A href="https://stackoverflow.com/questions/9945409/how-do-i-fix-the-error-named-pipes-provider-error-40-could-not-open-a-connec" target="_blank" rel="noopener">https://stackoverflow.com/questions/9945409/how-do-i-fix-the-error-named-pipes-provider-error-40-could-not-open-a-connec</A></LI> </UL> <P>Best Regards</P> Thu, 17 Mar 2022 14:13:35 GMT https://community.qlik.com/t5/QlikView/Always-on-Error-Could-not-open-a-connection-to-SQL-Server-53/m-p/1906558#M1227489 Chip_Matejowsky 2022-03-17T14:13:35Z