![Fixing failed to log in via [SMB] due to [NTLMv1 not permitted] @aice0927](https://i.ytimg.com/vi/u7es3cSPC5w/maxresdefault.jpg)
Uploaded July 2021 | Updated September 2026, 9 hours ago
This video show how to fix failed login via SMB due to NTMv1 not permitted after I upgrade my Synology 920+ from DSM 6.2.4-25556 to the latest Synology NAS DSM 7.
1. Start
2. Open Run or use Windows + R to open Run.
3. Type secpol.msc and press enter to open Local Security Policy.
4. In Local Security Policy choose Local Policies
5. Then click Security Options
6. Find the policy "Network security: LAN Manager authentication level"
7. By default its empty, in select "Send NTLMv2 response only. Refuse LM & NTLM".
8. Close the Local Security Policy and try to access the folder. Done.
Note: If not working, try to restart your PC.
Credits to:
community.synology.com/enu/forum/20/post/139200
#Synology
#SynologyDSM7
#NTLMv1
This video show how to fix failed login via SMB due to NTMv1 not permitted after I upgrade my Synology 920+ from DSM 6.2.4-25556 to the latest Synology NAS DSM 7.
1. Start
2. Open Run or use Windows + R to open Run.
3. Type secpol.msc and press enter to open Local Security Policy.
4. In Local Security Policy choose Local Policies
5. Then click Security Options
6. Find the policy "Network security: LAN Manager authentication level"
7. By default its empty, in select "Send NTLMv2 response only. Refuse LM & NTLM".
8. Close the Local Security Policy and try to access the folder. Done.
Note: If not working, try to restart your PC.
Credits to:
community.synology.com/enu/forum/20/post/139200
#Synology
#SynologyDSM7
#NTLMv1
![Fixing failed to log in via [SMB] due to [NTLMv1 not permitted]](https://i.ytimg.com/vi/u7es3cSPC5w/mqdefault.jpg "Fixing failed to log in via [SMB] due to [NTLMv1 not permitted]
This video show how to fix failed login via SMB due to NTMv1 not permitted after I upgrade my Synology 920+ from DSM 6.2.4-25556 to the latest Synology NAS DSM 7.
1. Start
2. Open Run or use Windows + R to open Run.
3. Type secpol.msc and press enter to open Local Security Policy.
4. In Local Security Policy choose Local Policies
5. Then click Security Options
6. Find the policy Network security: LAN Manager authentication level
7. By default its empty, in select Send NTLMv2 response only. Refuse LM & NTLM.
8. Close the Local Security Policy and try to access the folder. Done.
Note: If not working, try to restart your PC.
Credits to:
https://community.synology.com/enu/forum/20/post/139200
#Synology
#SynologyDSM7
#NTLMv1")
