Problem connecting with a 3G ZTE USB Modem

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http://forums.fedoraforum.org – Hello. I'm currently using Fedora 17 and trying to connect to a 3G network using a ZTE USB Modem. The modem worked very well in a previous Fedora 16 installation and still does on Windows. Modem configuration seems fine and it even recognizes the carrier's network and signal strength. But when I try to connect, it fails without a cause. Reviewing /var/log/messages I came across the log lines attached at the bottom of this message. Authentication succeeds and then: Code: NetworkManager[642]: PAP authentication succeeded pppd[1741]: Modem hangup pppd[1741]: Connection terminated. (HowTos)