I made a video of this issue since it just kinda hard to believe: http://www.quickesthosting.com/~spirit/vid.avi Size: 3.3mb Res: 1680x1050 Codec: xvid Sorry about the example site used in the video, most sites randomly have the issue, but this one was easy to capture. I get the problem with microsoft.com as well as yahoo shopping cart sites, but other sites I never see the problem. All vista computers on my network have this issue, MAC/Linux/WindowsXP do not have this issue. As well as virtual pc ON vista doesn't have this issue. My router is linux 2.6.xwith a custom iptables rulset that I made myself. I can only assume it's something I'm doing in my firewall that is specific to vista not liking. Or its a bug in vista that people ether don't notice or don't complain about. Condensed copy of my firewall (everything minus specific port forwards and ips that I'm open to) Code Snippet local="eth1"remote="eth0"wireless="eth2" for interface in /proc/sys/net/ipv4/conf/*/rp_filter; do/bin/echo "1" > ${interface}done /bin/echo "1" > /proc/sys/net/ipv4/tcp_syncookies/bin/echo "1" > /proc/sys/net/ipv4/ip_forward/bin/echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts/bin/echo "0" > /proc/sys/net/ipv4/conf/all/accept_source_route/bin/echo "0" > /proc/sys/net/ipv4/conf/all/accept_redirects/bin/echo "0" > /proc/sys/net/ipv4/conf/all/send_redirects/bin/echo "1" > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses/bin/echo "1" > /proc/sys/net/ipv4/tcp_ecn/bin/echo "1" > /proc/sys/net/ipv4/conf/all/log_martians /bin/echo "256960" > /proc/sys/net/core/rmem_default/bin/echo "256960" > /proc/sys/net/core/rmem_max/bin/echo "256960" > /proc/sys/net/core/wmem_default/bin/echo "256960" > /proc/sys/net/core/wmem_max iptables -P INPUT DROPiptables -F INPUTiptables -A INPUT -i ppp+ -j ACCEPTiptables -A INPUT -i $remote -p ICMP -j ACCEPTiptables -A INPUT -i lo -s 192.168.0.0/24 -j ACCEPTiptables -A INPUT -i ! $local -s 192.168.0.0/24 -j DROPiptables -A INPUT -i $local -j ACCEPTiptables -A INPUT -i ! $wireless -s 192.168.1.0/24 -j DROPiptables -A INPUT -i $wireless -p 47 -j ACCEPTiptables -A INPUT -i ! lo -s 127.0.0.0/8 -j DROPiptables -A INPUT -i lo -j ACCEPTiptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROPiptables -A INPUT -i $remote -p tcp ! --syn -m state --state NEW -j DROPiptables -A INPUT -i $remote -p ICMP --icmp-type echo-reply -m limit --limit 6/second ! -f -j ACCEPTiptables -A INPUT -i $remote -p ICMP --icmp-type destination-unreachable -m limit --limit 4/second ! -f -j ACCEPTiptables -A INPUT -i $remote -p TCP --dport 8000 -j ACCEPTiptables -A INPUT -i $remote -p TCP --dport 113 -j ACCEPTiptables -A INPUT -p TCP --dport 3306 -j DROPiptables -A INPUT -i $remote -p TCP --dport 5347 -j DROPiptables -A INPUT -i $wireless -p TCP --dport 5347 -j DROPiptables -A INPUT -i $remote -p TCP --dport 5900:5905 -j DROPiptables -A INPUT -i $wireless -p TCP --dport 5900:5905 -j DROPiptables -A INPUT -p TCP --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPTiptables -A INPUT -p UDP --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPTiptables -P OUTPUT ACCEPTiptables -F OUTPUTiptables -P FORWARD DROPiptables -F FORWARDiptables -A FORWARD -i $remote -o $local -m state --state ESTABLISHED,RELATED -j ACCEPTiptables -A FORWARD -i $local -o $remote -j ACCEPTiptables -t nat -Fiptables -t nat -A POSTROUTING -o $remote -j MASQUERADEiptables -t mangle -Fiptables -A FORWARD -i ppp+ -o $remote -j ACCEPTiptables -A FORWARD -i $remote -o ppp+ -m state --state ESTABLISHED,RELATED -j ACCEPT