Hi there,Were running more than 200 Computers and 70 Servers for years now. We use Windows 2k, XP, 2k3, Mac OS X, many Linux Distributions, Solaris and AIX without any problem like we have now with the first Vista-Clients that came in:They cant connect authoritative to the internet!The behavior is always the same:After installing vista everything seems to be fine. Some machines were running within 30 minutes in this "local access only"-trap - others within hours.Some of them can reach the www sporadically, some of them never again. Sometimes you can ping sites e.g. google.com - sometimes you can reach nothing outside. Sometimes it is working for minutes or hours again - but then again the connection is down for hours.It doesnt matter at all if these machines- use DHCP or static IP- are domain-member or not- use "privat" or "public" settings as location- have local firewall enabled or not or even not installed one- have filesharing enabled or disabled- have autotuninglevel=enabled or disabled- use different MTU and RWIN sizes- running RC1 or final release of any Vista (Busines or ultimate)- are brand new or elder Notebooks (HP nx9420, 8220, nx7010, IBM ThinkPad X60, T60, T43)- are selfmade desktopmachines or industry workstations (FSC Scenic series)- use diffenrent NICs (RTLxxx, Yukon Marvellxx, Broadcom, Intel e100x)- use onboard or offboard NICs- have IPv6 enabled or disabled- are the only Vista-machine running in network or not- are behind a stateful-inspection-enabled firewall or notAll machines where beeing installed from scratch. When we first noticed the problems we stopped installing anything else than Vista - no firewall neither virusscan engine.Unfortunately we already bought more than 50 licenses and installed a dozen of them. Were now busy with rolling them back to XP, some employees changed to a Mac (me too!)Cmon Microsoft, dontt tell all the people here that they have to change their gateways, providers a.s.o - face that there is a BIG BUG in your IP Stack or wherever inside this OS and make a useful suggestion or patch to solve this.When Vista is in the market during the next days you will be forced helter-skelter for a solution to this!So what can I tell you more to find out?On our internal gateway I dumped the traffic crossing the internal (!) NIC at packet level (tcpdump v). There I can see the traffic from vista clients disappearing: First everything is working as usual. When the local machine is reporting a connection change ("local access only") the traffic simply stops - it doesnt even TRY to cross the inner NIC of the gateway.The only trap of an internetless-vista station you can see in this state is its broadcasting:(tos 0x0, ttl 128, id 25224, offset 0, flags [none], length: 78) vistamachine.xxx.de.netbios-ns > 192.168.0.255.netbios-ns: NBT UDP PACKET(137): QUERY; REQUEST; BROADCAST14:24:26.587831 IP (tos 0x0, ttl 1, id 25234, offset 0, flags [none], length: 50) vistamachine.xxx.de.49953 > 224.0.0.252.hostmon: [udp sum ok] UDP, length: 22Thank you - Chris

addendum: Like all the other people posting similar problems our _local_ area network is working for Vistaclients, too. But in case of "local access only" you cant browse the network neighborhood although you can type "\\servername\" and browse and get used to its shares.Thank you - Chris

I have been having similar problems with my Vista Enterprise edition on my testbed here at work. I will update here if I find any information that could be of use.

disable ip6