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Ubuntu 12.04 LTS server not allowing incoming connections when using wlan0

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linux-howto

http://askubuntu.com – I have set up my computer with Ubuntu Server temporally for a minecraft server lan party i have port forwarded the correct ports but when trying to connect i get Connection refused: connect or Connection timed out: connect when i try to ping the local ip i get Destination host unreachable. it works fine if i plug in an Ethernet cord but at the party i will not have that option and there for need help allowing connections to come in from wlan0 any help is greatly appreciated (HowTos)