Experts Exchange Questions When using VPN, everything except Outlook works and can even ping exchange serverExample 3 Build a DMZ to Protect Networks with a Firewall, UDR, and NSG.Server Down Server Win.Error 00x.Hi,I have done with above troubleshooting and everything is fine, but issue is still persist.Microsoft Sql Server 2012 Firewall Ports Ping' title='Microsoft Sql Server 2012 Firewall Ports Ping' />I run repadmin replicate dest ADC1 lt my ADC server source DC0.Domain Controller also GC its giving me error.LDAP Error 8.Server Down Server Win.Error 00x.I proving ipconfig all and dcdiag result.C UsersAdministrator ipconfig all.Windows IP Configuration Host Name.DC1.Primary Dns Suffix .Node Type.Hybrid.IP Routing Enabled.No.WINS Proxy Enabled.No.DNS Suffix Search List.Ethernet adapter Ethernet.Connection specific DNS Suffix .Description.IntelR 8.L Gigabit Network Connection.Physical Address.C 2.DHCP Enabled.No. Autoconfiguration Enabled.Yes.Link local IPv.Address.PreferredIPv.Address.PreferredSubnet Mask.Default Gateway.DHCPv.IAID. DHCPv.Client DUID.F 9. 3 6.C 2.DNS Servers. Net.BIOS over Tcpip.EnabledDCDiagC UsersAdministrator DCdiag.Directory Server Diagnosis.Performing initial setup Trying to find home server.Home Server DC1 Identified AD Forest.Done gathering initial info.Doing initial required tests Testing server Default First Site NameDC1.Starting test Connectivity.DC1 passed test Connectivity.Doing primary tests Testing server Default First Site NameDC1.Starting test Advertising.DC1 passed test Advertising.Starting test Frs.Event.DC1 passed test Frs.Event.Starting test DFSREvent.There are warning or error events within the last 2.DC1 failed test DFSREvent.Starting test Sys.Vol.Check. DC1 passed test Sys.Vol.Check. Starting test Kcc.Event.DC1 passed test Kcc.Event.Starting test Knows.Of.Role. Holders.DC1 passed test Knows.Of.Role. Holders.Starting test Machine.Account.DC1 passed test Machine.Account.Starting test NCSec.Desc.DC1 passed test NCSec.Desc.Starting test Net.Logons.DC1 passed test Net.Logons.Starting test Objects.Replicated.DC1 passed test Objects.Replicated.Starting test Replications.DC1 passed test Replications.Starting test Rid.Manager.DC1 passed test Rid.Manager.Starting test Services.DC1 passed test Services.Starting test System.Log.DC1 passed test System.Log.Starting test Verify.References.DC1 passed test Verify.References Running partition tests on Forest.Dns.Zones. Starting test Check.SDRef.Dom. Forest.Dns. Zones passed test Check.SDRef.Do. Starting test Cross.Ref. Install Default Mail Client Internet Explorer 9 . Validation. Forest.Dns.Zones passed test Cross.Ref.Vali Running partition tests on Domain.Dns.Zones. Starting test Check.SDRef.Dom. Domain.Dns. Zones passed test Check.SDRef.Do. Starting test Cross.Ref.Validation. Domain.Dns.Zones passed test Cross.Ref.Vali Running partition tests on Schema.Starting test Check.SDRef.Dom. Schema passed test Check.SDRef.Dom. Starting test Cross.Ref.Validation. Schema passed test Cross.Ref.Validation Running partition tests on Configuration.Starting test Check.SDRef.Dom. Configuration passed test Check.SDRef.Dom. Starting test Cross.Ref.Validation. Configuration passed test Cross.Ref.Valid Running partition tests on rk.Starting test Check.SDRef.Dom. Check.SDRef.Dom. Starting test Cross.Ref.Validation. Cross.Ref.Validation Running enterprise tests on rk.Starting test Locator.Check.Locator. Check.Starting test Intersite.IntersitePlease have a look and help me.Resolving could not open a connection to SQL Server errors.Problem.Sometimes you may have issues connecting to SQL Server and you may get messages such as the following ERROR provider Named Pipes Provider, error 4.Could not open a connection to SQL Server Microsoft SQL Server, Error An error has occurred while establishing a connection to the server.Named Pipes Provider, error 4.Could not open a connection to SQL Server Microsoft SQL Server, Error 5Or.An error has occurred while establishing a connection to the server.When connecting to SQL Server 2.SQL Server does not allow remote connections.Named Pipes Provider, error 4.Could not open a connection to SQL Server Microsoft SQL Server, Error 1.Or.A network related error 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.TCP Provider, error 0 No such host is known.Microsoft SQL Server, Error 1.These errors could be for either Named Pipes connections or TCPIP connections.In this tip, we look at what may be causes to these errors and how to resolve.Solution.There could be several reasons you get these error messages.Follow the below steps to see if you can resolve the issue.Step 1.Make sure you are able to ping the physical server where SQL Server is installed from the client machine.If not, you can try to connect to the SQL Server using an IP Address for default instance or IP AddressInstance Name for a named instance.If it resolves using an IP address, you can add the SQL Server machine into etchost file.To add the entry in the host file type System.Rootsystem.Notepad.In the below image I added IP address 7.SQLDBPool.Now I should be able to use the machine name instead of the IP address to connect to the SQL Server.Step 2.Make sure the SQL services are running You can check the SQL Server services by using the SC command or SQL Server Configuration Manager.Many times you may find that the SQL Server instance is not running.Using SQL Server Configuration Manager.Using SC command.Please note for a named instance you have to write the command as follows using the correct instance name sc query mssqlinstancename.Step 3.Check that the SQL Browser service is running.If you have installed a SQL Server named instance and not configured a specific TCPIP port, incoming requests will be listening on a dynamic port.To resolve this you will need to have the SQL Browser service enabled and running.You can check the browser service status using Step 2 and either using SQL Server Configuration.Manager or the SC command as follows.Step 4.Make sure you are using the correct instance name.When you connect to a default instance, machinename is the best representative for the instance name and when you connect to a named instance such as sqlexpress, you should specify machinenameinstancename.Step 5.Check that SQL Server is in the network.You can use the SQLCMD L command to retrieve the list of SQL Server installed in the network.Note that this will only return SQL Servers if the SQL Browser service is running.Step 6.Check for TCPIP and Named Pipes protocols and port.Open SQL Server Configuration Manager and check the SQL Server Network Configuration protocols.You should enable Named Pipes and TCPIP protocol.For the TCPIP protocol, right click and select properties to check the TCPIP communication port as well.The default port is 1.Step 7.Check to see if remote connections is enabled.Right click on the server name in SSMS and select Properties.Go to the Connections tab and make sure Allow remote connection to this server is checked.If you need to make a change, you must restart the SQL Server instance to apply the change.You can also configure the remote server connections using the below commands.If you make changes you will need to restart SQL Server for these to take affect.The settings below are equivalent to the settings in the image above.Step 8.Check the error log for issues.Locally connect to SQL Server and check the error log for the port entry.You can execute XPREADERRORLOG procedure to read the errors or use SSMS.You should see entries similar to below that shows Named Pipes and TCPIP are enabled and the port used for TCPIP which is 1.Add Corporation Link Live Map Microsoft Pad Print Scratch Search there.Step 9. Configure the Windows Firewall for the SQL Server port and SQL Browser service.Go to Control Panel Click on Windows Firewall Go to exception tab as shown below.You can also read this tip for more information as well.Click on Add Port.Click on Add Program.SQL Browser service.Here you need to get the browser service executable path, normally it is located at C Program FilesMicrosoft SQL Server9.Shared location for SQL 2.Browse the location and add the SQLBrowser.Step 1.If you are able to connect to SQL Server by physically logging on to the server, but unable to connect from a client computer then execute the below to check the SPN.SPN is not found.EXEC xpreaderrorlog 0,1,could not register the Service Principal Name,Null.If the SPN is not found, read this article and this article for more details about how to setup and register an SPN.Next Steps.Last Update 2.About the author.Jugal Shah has 8 years of extensive SQL Server experience and has worked on SQL Server 2.R2.
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