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I updated to TOS6 this morning. Now I have the problem, that one Win11-PC can access the NAS via Win-Network-Folder without any problems, but the other one can`t. I always get message "cant be accessed, probably no permission". Fun fact: directly after the update, all worked fine!

Username/Password of course are correct. I also created a new user especially for this PC, but same. Access via Webbrowser and TNAS PC works.
I can create a Network-Drive via TNAS-PC, and then can access my Folders. Problem here: the Network-Drive disappears after restart, so I also can`t create Network-Drives / shortcuts to the folders, the connection is lost after restart.

As the other PC has access without any problems, I absolutely don`t understand what the reason could be. Of course NetBios etc. already checked.

Hello! Thank you for reaching out to Terramaster!
Please follow the guidelines to check your PC that cannot be accessed normally and troubleshoot the computer configuration factors.
viewtopic.php?t=1299

Hola a todos. Les comparto mi experiencia que tuve con un F5-221. Cuando lo tenía con el sistema TOS 4.x, no podía conectarme desde Windows 11 24H2 (cosa que sí podía hacer en Windows 11 23H2). Luego reemplacé el sistema por el TOS 5.x, el cual tiene las opciones ''descubrimiento UPnP'', y ''wsdd2 (servicio de windows discovery)'' , los activé y puse la región y horario que corresponde a mi localización, y ya pude acceder en directo al TOS.

Quizá estos comentarios puedan ser de utilidad.

Could the PC that cannot access the NAS be using cached credentials from a previous connection, which might conflict with the new user setup after the TOS6 update?

Ezrani wrote: ↑25 Mar 2026, 16:57 Could the PC that cannot access the NAS be using cached credentials from a previous connection, which might conflict with the new user setup after the TOS6 update?

Yes, this is a very possible scenario. The PC that cannot access the NAS is likely using the cached credentials from a previous connection (Windows Credential Manager or SMB client cache). You can clear all related network caches and credentials on the PC. You can also refer to this link: viewtopic.php?t=2759