搭建SQL Server 2017服务器后数据库引擎连接失败（错误18456）求助

Hey there, let’s work through this connection issue you’re hitting. It’s strange that you can connect to Analysis Services and Integration Services smoothly with Windows Authentication, but the Database Engine is throwing that 18456 error alongside the shared memory pipe message. Here are targeted, actionable steps to fix this:

1. Verify Database Engine’s Authentication Mode #

First, confirm the Database Engine is configured to allow Windows Authentication:

• Log into the SQL Server machine directly (via RDP or local console) and open SQL Server Configuration Manager.
• Navigate to SQL Server Services → right-click your Database Engine instance (usually MSSQLSERVER for default instances) → select Properties.
• Switch to the Security tab and check that Windows Authentication Mode is selected. If not, update this setting and restart the SQL Server Database Engine service.

2. Check Your Windows Account’s SQL Server Login #

Even with Windows Auth, your account needs a corresponding login in the Database Engine with connection permissions:

• If you can connect via the server’s local SSMS, expand the server node → Security → Logins.
• Look for your Windows account (formatted as DOMAIN\me or COMPUTERNAME\me). If it’s missing, right-click Logins → New Login, select Windows authentication, and enter your account details.
• For existing logins: Right-click the login → Properties → go to the Status tab. Ensure Login is set to Enabled. Also, check the Server Roles tab to confirm at least the public role is assigned (this grants basic connection access).

3. Validate Shared Memory Protocol Configuration #

The "pipe另一端无进程" error points to potential issues with the shared memory protocol:

• In SQL Server Configuration Manager, go to SQL Server Network Configuration → Protocols for [Your Instance Name].
• Confirm Shared Memory is set to Enabled. If it was disabled, turn it on and restart the Database Engine service.
• Even if enabled, try restarting the Database Engine service—stale pipe connections can sometimes trigger this error.

4. Double-Check the Connection Target/Instance Name #

If you’re using a named instance (not the default), your connection string might be incorrect:

• In SQL Server Configuration Manager, check the instance name under SQL Server Services (listed as SQL Server ([Instance Name])).
• For named instances, you’ll need to connect using myserver01\InstanceName instead of just myserver01.

5. Dig Into Detailed Error Logs #

For a precise diagnosis, check the SQL Server error logs:

• From the server’s local SSMS, right-click the server node → Manage → SQL Server Logs.
• Open the latest log file and look for entries with error code 18456. The log will include a state code (e.g., state 11 means the login doesn’t exist, state 12 means the login is disabled) that narrows down the exact root cause.

Start with the first two steps—they’re the most likely fixes when other SQL Server services work but the Database Engine rejects your Windows login.

内容的提问来源于stack exchange，提问作者coinbird