I keep loosing credential access from pc to NAS. os reinstall only works

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carlocki wrote:

Microsoft Windows [Versione 10.0.19044.2130]
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C:\Users\Carlo>net use a: \\192.1xx.1xx.1xx\data /user:admin @xxxxxxxxxx
Errore di sistema 1219.

Le connessioni multiple a un server o a una risorsa condivisa da parte dello stesso utente, utilizzando più di un nome utente, non sono consentite. Interrompere tutte le connessioni precedenti al server o alla risorsa condivisa e riprovare.

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This error is a PC issue.  

Windows only allows you to access the NAS using one username/password.  If the PC already has a connection to the NAS using a different username/password, you will get this error.  The net use /del /y normally closes all those connections - which is why I always tell people to use that command before trying to map a NAS share to a drive letter.  But sometimes that command doesn't prevent the 1219 error.

You can also try substituting the NAS hostname for the IP address - Windows treats the hostname as a different device than the IP address.

Note that rebooting the PC will close all the connections, but there might be something happening at startup to reopen one.