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Error Code 303

Solution for Error Code 303: Invalid network path or sharing service has been disabled.

Ivy

By Ivy Updated on November 14, 2025

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This article applies to: all versions of AOMEI Backupper.

Introduction:

Sometimes when you want to backup to NAS, you will get the error code 303 during the backup progress.

Information is that Invalid network path or sharing service has been disabled. Because there is something wrong with the connecting to NAS.

Backup is initializing...

Information Code:303

Invalid network path or sharing service has been disabled. Please check whether the network is accessible and whether the sharing service of the target computer exists, and then try again.

Solutions:

1. Please check if the computers or programs connected to NAS have reached the ceiling of NAS. If it is, you need to disconnect some computers or programs so that AOMEI Backupper is able to connect the NAS to do the backup.

2. AOMEI Backupper is disconnect to NAS or there is connection timeout for some reasons. please delete "NAS.xml" file under the path（C:\ProgramData\AomeiBR). After that, please re-connect your NAS.

Please note that "ProgramData" is a hidden folder. So you first need to show hidden folders/files on Folder Options.

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If there is still any problem, please feel free to contact our AOMEI Support Team.

Ivy
Ivy · Editor
Ivy, our dedicated editor at AOMEI Technology, is committed to providing valuable insights and guidance in data protection. Her mission is to empower everyone with her knowledge of computer backup and recovery, disk cloning, file synchronization, and more. Ivy's goal is to do her best to ensure your digital world remains safe and secure.