Tech Support Forum - View Single Post - [SOLVED] Vista SP1 changed sharing behavior

tripap · 03-06-2008, 06:52 PM

I've solved the problem of not being able to see network shares on my Vista machine from an XP machine after installing Vista SP1. The problem was authentication level for LAN Manager. Vista defaults to NTLMv2, and my Vista machine only allowed that level. My XP machine was set for LM & NTLM, but did not deal with NTLMv2. I solved the problem by going into Local Security Policy on both machines and changing the Network security: LAN Manager authentication level to "Send LM & NTLM - use NTLMv2 session security if negotiated" on both. I had to reboot to have the change take effect, and the problem was eliminated.

03-06-2008, 06:52 PM	#6 (permalink)
tripap Registered User Join Date: Mar 2008 Posts: 8 OS: xp sp2, vista sp1	Re: Vista SP1 changed sharing behavior I've solved the problem of not being able to see network shares on my Vista machine from an XP machine after installing Vista SP1. The problem was authentication level for LAN Manager. Vista defaults to NTLMv2, and my Vista machine only allowed that level. My XP machine was set for LM & NTLM, but did not deal with NTLMv2. I solved the problem by going into Local Security Policy on both machines and changing the Network security: LAN Manager authentication level to "Send LM & NTLM - use NTLMv2 session security if negotiated" on both. I had to reboot to have the change take effect, and the problem was eliminated.