Logon failure: user account restriction. Possible reasons are blank passwords not allowed, logon hour restrictions, or a policy.

Kronologinya begini..
Komputer A sharing folder n password sharing nya di turn on. Nah pas komputer B mau buka folder sharing si A, muncul error "Logon failure: user account restriction. Possible reasons are blank passwords not allowed, logon hour restrictions, or a policy" .

itu kenapa ya?
trus ane disable limit blank password bla2 di security policy. Ane coba buka data sharngnya si komputer A bisa sih. tp ga disuruh isi username sama password dulu.
Kayaknya si komputer B langsung otomatis logon sebagai guest x ya?jadi bisa langsung masuk tanpa perlu masukin password..
Kira2 gimana ya cara supaya tiap Komputer B mau akses folder sharing si kompter A disuruh isi username n password dulu???
Mohon bantuannya ga .Tq

mohon penjeleasannya ya soalnya ane coba cari2 ga ketemu.