Logon failure: unknown username or bad password

 

“Logon failure: unknown username or bad password.” when trying to access Windows XP share from Windows 7

Skenario :

PC A menggunakan Windows XP SP3 dan terinstall printer yang di share. PC B menggunakan Win 7 dan konek ke shared printer di PC A. PC C akan konek ke shared printer di PC A namun ada error spt nampak dibawah ini :

setelah googling nemu link spt dari sini dan akhirnya solved.

Solusinya, copas dari link di atas :

– Open the Start menu(Buka start menu)
– Type “Local Security Policy” in the search box(di search box ketik local security policy)
– Open Local Security Policy(buka local security policy)
– Navigate to “Local Policies” -> “Security Options” and then locate the entry named “Network security: LAN Manager authentication level”. Double click on it.
– In the dropdown list choose “Send LM & NTLM – use NTLMv2 session security if negotiated
– Click OK

It seems that a recent Windows Update has changed that policy’s settings to be undefined, which —from what I can tell— forces NTLMv2 session security always. My XP installation mustn’t have NTLMv2 capability and that is why I kept seeing “Logon failure: unknown username or bad password.” errors.

After changing the local policy I was immediately able to connect to my network shares again