Fix ERROR_RECOVERY_FAILURE (0X000004FF) – Transaction Recover Failed

What Is ERROR_RECOVERY_FAILURE (0X000004FF)?

This error shows up when SQL Server or Exchange can't replay a transaction log after a crash or unexpected shutdown. The culprit here is almost always a corrupted log file or a disk that ran out of space mid-recovery. You'll see it in the Windows Application Event Log with Event ID 0X000004FF. The system tries to roll forward committed transactions, but something blocks it – a bad page, a missing LSN, or file system damage.

I've seen this most often after a power failure on a Hyper-V host running a SQL 2016 instance, or when an Exchange 2013 database got force-dismounted. Don't panic – you've got options.

Quick Fix (30 Seconds) – Restart the Service

Sometimes the error is a one-time glitch. The service couldn't read a temp file, or the disk was busy. A restart clears transient locks and retries recovery cleanly.

1. Open Services.msc.
2. Find SQL Server (MSSQLSERVER) or Microsoft Exchange Information Store – whichever threw the error.
3. Right-click and choose Restart.
4. Check the Application Event Log after restart. If no 0X000004FF appears again, you're done.

Nine times out of ten, this does nothing if corruption is real. But it's free and fast. Try it first.

Moderate Fix (5 Minutes) – Check Disk Space and Run CHKDSK

Disk issues are the second most common cause. Recovery needs room to write. If the drive is full, the transaction log can't grow, and recovery fails.

1. Open This PC and check free space on the drive holding the database and log files.
2. If free space is under 10%, delete temp files or move logs to another drive. Aim for 20% free.
3. Run CHKDSK on the drive: open Command Prompt as admin, type chkdsk C: /f (replace C: with your drive letter). Press Y to schedule on next reboot.
4. Reboot the server. Let CHKDSK fix file system errors.

After reboot, restart the database service. If the error persists, move to the advanced fix.

Advanced Fix (15+ Minutes) – Repair the Database

This is the real fix. For SQL Server, you run DBCC CHECKDB. For Exchange, use ESEUTIL. Pick your poison.

For SQL Server

1. Open SQL Server Management Studio (SSMS) as admin.
2. Run this command in a new query window:
   

   ALTER DATABASE [YourDatabaseName] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
   GO
   DBCC CHECKDB('YourDatabaseName', REPAIR_ALLOW_DATA_LOSS);
   GO
   ALTER DATABASE [YourDatabaseName] SET MULTI_USER;
   GO

3. This tries to repair the corruption. It may delete some data – that's why you need a backup first. If you have a recent backup, restore instead.
4. If REPAIR_ALLOW_DATA_LOSS fails, try REPAIR_REBUILD first (less aggressive):
   

   DBCC CHECKDB('YourDatabaseName', REPAIR_REBUILD);

For Exchange Server

1. Open Command Prompt as admin.
2. Navigate to Exchange bin folder: cd "C:\Program Files\Microsoft\Exchange Server\V15\Bin"
3. Run soft repair first:
   

   eseutil /r Enn /l "C:\Program Files\Microsoft\Exchange Server\V15\Mailbox\Mailbox Database 123\Corrupted.edb"

4. If that fails, run hard repair:
   

   eseutil /p "C:\Program Files\Microsoft\Exchange Server\V15\Mailbox\Mailbox Database 123\Corrupted.edb"

5. Warning: Hard repair drops corrupted records. Mount the database after and run isinteg -fix -test alltests from the Exchange Management Shell.

Both commands log results. Look for "repair completed successfully" in the output.

What NOT to Do

• Don't delete the transaction log manually. SQL Server won't recover without it.
• Don't run DBCC CHECKDB with REPAIR_ALLOW_DATA_LOSS on a production system without a backup.
• Don't ignore disk errors – if CHKDSK found bad sectors, replace the drive.

Still Stuck?

If none of this works, you're dealing with hardware failure or a corrupted backup. Restore from the last clean backup. If you don't have one, call Microsoft support – give them the exact error 0X000004FF and the full event log. They've seen this a thousand times.