I'm using Ubuntu 18.04 and try to connect a local *samba client* to my Windows AD. I use the packages squid samba winbind libnss-winbind. Both machines are already using an *ntp* server for sync. this is my samba config [global] netbios name = sqntlm workgroup = MY security = ADS realm = MY.CU encrypt passwords = yes min protocol = SMB2 max protocol = SMB3_11 client min protocol = SMB2 client max protocol = SMB3_11 winbind use default domain = yes winbind enum users = yes winbind enum groups = yes winbind uid = 10000-20000 winbind gid = 10000-20000 I integrate the client to the AD without problems, i can mount folders and i can also share folders without problems, but when y try the command *wbinfo -a MY\\user1%'123*/'* it show: *plaintext password authentication succeeded** **challenge/response password authentication failed** **Could not authenticate user MY\user1 with challenge/response* Can someone be so nice to explain why this is happening. -- Saludos Cordiales Lic. Alex Gutiérrez Martínez Tel. +53 7 2710327