I love OMV, but I have consistently run in to an issue while using SMB shares with Windows 7 and 10. The issue is that the username and password prompt just constantly comes back despite proper credentials, and there is no way to access the shares. There are many many versions of windows 10 and 7 that default to Send LM & NTLM - NTLMv2 session if security is negotiated under local security policy > Network security: LAN Manager authentication level. When this is the case it does not negotiate the higher revision of the protocol. I find this issue is random on new installs and random old installations of windows.
When this is set, there is no way to get to any shares. To make the shares work you have to set it to Send NTLMv2 response only. Initially I nearly got rid of OMV altogether, until I found a post on a different forum about this issue. Why is it that OMV requires NTLMv2 authentication. Is there anyway this could be changed to just work, or is there a setting I am missing?
For anyone experiencing this issue, the fix is as follows
Run local security policy
click Local Policies
Click Security Options
FInd Network Security LAN Manager authentication level
Change the option to Send NTLMv2 only.
This has to be done per PC that experiences the issue