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port forwarding doesn't work with FQDN

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linux-howto

http://serverfault.com – I have a regular Linksys wireless router. I'm doing port forwarding for an internal server. All goes well when I use external IP address of wireless router but no connection is established when I use FQDN instead of external IP address. My DNS works and I checked it by nslookup. That's so weird. (HowTos)