WAN interface not functioning with FiOS

[TinySquid]

Hello everyone! I'm rather new to Untangle and happened to run into an odd problem this morning while switching over from TW Cable to Verizon FiOS (yes, I did do a fair amount of searching before posting but wasn't able to really find an answer).

So, here's what's up:

I recently built a system (perhaps 3 or 4 weeks ago?) for use with Untangle around the Intel D525MW Atom board and an Intel Pro1000 GT PCI NIC and configured it for use with my existing cable internet connection (cable modem --> Untangle box --> main network switch). For reference, the onboard Realtek 8111E is configured as the WAN interface and the Pro1000GT is configured as the LAN interface.

Anyway, the Untangle setup functioned wonderfully until this morning's switch to 25/25Mbit Verizon FiOS (internet only, over ethernet, handled via DHCP, no TV, no phone, no coax). For whatever reason, the Untangle box refuses to acknowledge the ethernet connection from the FiOS ONT. I did the following check both at the ethernet wall jack where my rack is located and using a known good 50-foot cat5e cable plugged directly into the ONT (had to shut down and relocate hardware for the second test):

ONT --> ethernet WAN port on Verizon router --> laptop (everything worked, proceeded to kill router DHCP lease and disconnect)
ONT --> laptop (everything worked, proceeded to kill DHCP lease and disconnect)
ONT --> Untangle box --> laptop (Untangle could not detect that anything was connected to the WAN interface [control panel listed WAN as disconnected], could not retrieve DHCP info as a result... lights on the NIC didn't light up and ONT ethernet light was flashing red/green, indicating that there's something wrong with the connection)
Cable modem --> Untangle box --> laptop (everything worked)

I also tried reconfiguring Untangle's WAN and LAN interfaces (switching the Pro1000 to WAN and the 8111E to LAN) and things still didn't work correctly... The Intel NIC's lights lit up when connected to the ONT but Untangle incorrectly detected the connection as a 10Mbit full duplex ethernet connection (should have been 100Mbit) and failed to retrieve DHCP info (and this failed test caused me to have to call Verizon and have them kill the DHCP lease on their end so that I could swap back to the Verizon router).

Anyone have any ideas as to what might be going on here?

[TinySquid]

I've been doing a little more investigating (including throwing my D-Link DGL-4300 router into the testing mix) and I'm starting to think that I may have an ONT problem...

The DGL-4300 status menu continually cycles between WAN connected/disconnected with a slow on/off blinking of the WAN light. The rate of the blinking and connect/disconnect status about matches the green/red blinking of the ONT's ethernet light...which also matches the slow switch activity/on/off blink that I was getting when I threw an unmanaged switch between the ONT and Verizon router (which made it impossible for the Verizon router to pull DHCP info... this was done as a control since I also stuck a switch between the Untangle box and the ONT just to see if it made a difference). Also, after watching the Verizon router during startup, it seems that the Verizon router may be having difficulty establishing a connection itself (the WAN light will randomly go out while trying to establish a connection which causes the DHCP light to reset and the unit to take several minutes to establish a connection).

I guess I'll have to get in touch with Verizon to see what can be done--I have no idea how many years this ONT has been on the outside of the house (it was already here when we moved in and that was about a year ago).

[TinySquid]

Sorry for the triple post, but I don't seem to have obvious edit privileges...

Anyway, for anyone who comes across a similar problem with FiOS in the future (some computers not acknowledging an ethernet connection when plugged directly into the ONT (resulting in alternating red/green ethernet light on the ONT), other computers acknowledging connection and pulling DHCP but being limited to 10Mbps (resulting in the ONT ethernet light being both red and green at the same time...and looking kinda amber-ish), all while others appear to work fine), the fix seems to be pulling the power plug on the ONT and disconnecting the backup battery for about 5-10 minutes.