networking - port forwarding on my homw routermodem -


i have service spectrum , using modem/router. have 3 computers act server , want assign different port numbers them can access them out side. changed router ip forwarding setting take port 80, port 432 , port 8080 redirect traffic these 3 computers. reason port 80 seems work.
thought there wrong computers when assign port 80 of these 3 computers, works. how come can't have other ports 80?. changed ip triggering , turn off firewalls no luck. has 1 has issue in home network ( spectrum)? in advance advice


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