ERROR_INVALID_SHARENAME - 1215 (0x4BF)
The format of the specified share name is invalid.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_INVALID_SHARENAME error code indicates that the format of a specified share name is not valid according to the system's expectations. This can occur during file or directory operations, particularly when dealing with network shares.
Error Details
This error typically arises from an invalid character in the share name, incorrect naming conventions, or other formatting issues. The specific details of what constitutes an invalid share name are defined by the Windows operating system and its file system protocols (e.g., SMB).
Usage Context
The ERROR_INVALID_SHARENAME can be encountered in various scenarios where network shares are accessed or created. This includes operations such as mounting a network drive, accessing shared folders over a network, or configuring share settings.
Developer Interpretation
When encountering this error, developers should ensure that the share names used adhere to the naming conventions and character restrictions defined by Windows. Common issues include using reserved characters in the name, exceeding maximum length limits, or including non-alphanumeric characters where they are not allowed.
Related Errors
ERROR_PATH_NOT_FOUND(2)ERROR_INVALID_NAME(123)ERROR_BAD_NETPATH(67)
FAQ
Q: What causes the ERROR_INVALID_SHARENAME?
A: The error is typically caused by an invalid share name, such as containing reserved characters or exceeding length limits.
Q: How can I resolve this issue?
A: Ensure that the share names used are valid according to Windows naming conventions and do not contain any prohibited characters. Verify that the maximum allowed length of the share name is respected.
Summary
The ERROR_INVALID_SHARENAME error code 1215 (0x4BF) indicates an invalid format for a specified share name in Windows. Developers should ensure compliance with naming conventions and character restrictions to avoid this issue.