Ok, we got hold of a Windows XP box with Chrome version same as yours. We managed to repeat your error once. But the error went away immediately after we cleared the DNS cache with “ipconfig /flushdns“. We tried to repeat the error for a second time but were not able to.
One thing we noticed was that after we cleared the DNS cache, Windows XP was no longer caching DNS answers. That helps explain why we weren’t able to repeat the error. And it seems to indicate that Windows XP DNS caching is somewhat unpredictable.
After you do “iptables /flushdns“, can you do “iptables /displaydns” to see if the DNS cache was really cleared?
Also, if this happens again, can you reboot the PC instead the router and see if the problem goes away?