SQL SERVER – Error: Timeout (30000 milliseconds) Waiting for the SQL Server (MSSQLSERVER) Service to Connect

Windows gave SQL Server thirty seconds to report that it had started, and it hit the timeout before it answered. Almost always SQL Server is fine and simply busy. It is recovering databases, and recovery does not care about the service control manager’s patience.

What the Message Actually Means

Timeout (30000 milliseconds) waiting for the SQL Server (MSSQLSERVER)
service to connect.

This is a Windows message, not a SQL Server one. The service control manager starts a service and waits for it to say it is running. SQL Server did not say so within thirty seconds.

Note what it does not say. It does not say SQL Server failed. Very often the service carries on starting quite happily after Windows has given up waiting, and is running a few minutes later.

Look at the Error Log First

The service could not talk to Windows, but it was almost certainly writing to its own log the whole time. That log is where the truth is.

Find it on disk, because you may not be able to connect yet:

SELECT SERVERPROPERTY('ErrorLogFileName') AS errorlog;

Open the ERRORLOG file in a text editor. Look for lines about recovery, which report progress as a percentage per database. If those are moving, the answer is simply to wait.

Why Startup Takes So Long

Recovery of a large database. Every database has to be brought to a consistent state before it can be used. A long transaction that was open when the service stopped has to be rolled back first, and that is single threaded.

Many databases. Hundreds of small databases can take longer than one large one, because each carries its own startup cost.

tempdb being rebuilt. It is created fresh at every start. If it is configured very large and instant file initialisation is off, every byte gets zeroed before the service is ready.

Slow or unavailable storage. A database whose files live on a share or a volume that has not come online yet will hold everything up.

Instant File Initialisation Is Worth Checking

SELECT servicename, service_account, instant_file_initialization_enabled
FROM sys.dm_server_services;

If that reports it is off, the service account lacks the Perform Volume Maintenance Tasks right. Granting it means new data file space is taken without zeroing it first, which makes tempdb creation and file growth dramatically quicker.

This is one of the few settings that is nearly always worth turning on. It applies to data files, not log files, which always get zeroed.

Giving Windows More Patience

If startup genuinely needs longer, the thirty seconds can be raised. It is a registry value that applies to all services, not only SQL Server, and it lives under the control area of the current control set as ServicesPipeTimeout, expressed in milliseconds.

Sixty thousand is a common value. The machine has to be restarted for it to take effect.

Treat this as the last step rather than the first. Raising the timeout makes the message go away. It does not make anything start faster, and if startup is taking minutes there is usually a reason worth knowing.

When It Is Not Just Slow

A few causes are real failures wearing this message.

A service account whose password changed, so it cannot log on at all. A missing or corrupt master database, which stops everything before it starts. A port already taken by something else. A certificate configured for encryption that has expired or been removed.

All of those write a clear line in the error log, which is why reading it comes first.

Starting It by Hand to See What Happens

When the log is not enough, start the engine from the command line rather than as a service. It then writes straight to the console and nothing is waiting on a timer.

Running it with the minimal configuration and single user options gets past a bad configuration setting, which is the usual reason for doing this. Stop it cleanly and start the service normally once you know what was wrong.

Checking Afterwards

SELECT name, state_desc, recovery_model_desc
FROM sys.databases
WHERE state_desc <> 'ONLINE';

SELECT sqlserver_start_time FROM sys.dm_os_sys_info;

The first query should return nothing. Any database still recovering or suspect is the one that held you up, and it is the one to look at before the next restart.

This is not SQL Server failing to start, it is Windows running out of patience while it does.

Published by Pinal Dave on SQLAuthority. More of my work at pinaldave.com.