You shouldn't need the client lanman auth options unless you're using a very old (Win98) computer as your Samba server. In my opinion, the security risks of enabling file sharing on a Win98 computer is extreme and inadvisable even in a trusted network. You should either upgrade the Win98 machine, or remove it from the network and use it as an independent workstation.
Some NAS devices have this problem, but there are other ways around that.
Thanks though.
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