Windows XP cannot connect to 2012 R2 file shares

Legacy systems that use SMB 1.0 / CIFS may not be able to connect to shares hosted on a system running Windows Server 2012 R2.

Example systems:
Windows XP
Windows Server 2003
Windows Server 2003 R2

First, check to make sure you have "SMB 1.0 / CIFS File Sharing Support" installed. This is the default on Windows Server 2012 R2.


The "srv" service may be missing.

Check for this registry key:


One fix:

1) Remove SMB 1.0 / CIFS File Sharing Support.
2) Reboot.
3) Reinstall SMB 1.0 / CIFS File Sharing Support.
4) Reboot.

The registry key and service should be installed.

You can also try to re-insert the missing registry key:

Windows Registry Editor Version 5.00