Hi all, I repost the message about the signatur because I've not had any response. This time I hopefuly to get some ideas. When we put the parameter "server signing = auto or Yes" in smb.conf, the Windows XP clients can no longer connect to the samba (3.0.2), the "net use \\server\ipc$ /u:user password" return error 64. If I disabled the "server signing" the connection went ok. I've also checked register setting on XP (LMcompatibilityLevel, enablesignatures etc..) but no progress was made. The "server signing = auto" will make the samba to send the "security mode = 0x7" in netgotiate protocol response, that means "security =user" and "security signatures enabled" (not mandatory). So I can't understand why the XP clients didn't work with this set. From the ethereal the only deferents are the "negotiate protocol response", the others (session setup andX, tree connect) are same in both cases. Any one could kindly help me? Jianliang Lu TieSse s.p.a. Ivrea (To) - Italy j.lu@tiesse.com luj@libero.it http://www.tiesse.com Jianliang Lu TieSse s.p.a. Ivrea (To) - Italy j.lu@tiesse.com luj@libero.it http://www.tiesse.com