Hi,
I have understood your issue after you replied to me. Although the shared driver is in other domain, the shared driver is also in the same sub-network as yours, so you could
access it in Windows 7. I infer it is shared settings problem that you cant access it in Windows 8.1. I suggest you follow the steps below to troubleshoot the issue.
Firstly, check the shared permissions. Right click the drive that you want to share > Properties. In Sharing tab, click share, then add your user name which you
want to access to the shared drive. Choose the PC and click Share. Back to the Sharing tab > Advanced Sharing > Permissions. In the new window, choose the user name you want to share to, and select the permissions for the username.
In addition to checking permissions, you would better to check the connection on your PC which you want to access. Disable the 3rd party anti-virus software. Go to Control
Panel > Network and Internet > Network Connections. Right-Click on the connection and choose Properties. Click Internet Protocol (TCP/IP) Version 4 > Properties > Advanced. In the Advanced TCP/IP settings windows, go to WINS tab. Under
NetBIOS setting, click Enable NetBIOS over TCP/IP, and then click OK.
Wish you can access it smoothly.
Best Regards
Simon