I was issues at my in-laws. I'm working remotely for 2 weeks and realized I have intermitent issues connecting to my company's intranet via VPN. We use Juniper Network Connect.
My in-laws have Verizon Fios using the ActionNet MI424WR modem/router.
When I'm connected on the VPN, my connection to work is awful. Remote Desktop session continually hang off an on. The same thing goes for SSH session. Connection to exchange is also slow/awful.
I finally went to my in-laws business office. And over there, I have no problem at all. So I thought it must the Fios or the modem/router. That's when I found this thread.
Anyway, this thread or any like it didn't help. As far as I can tell the router was still in it's default setting, except the admin password was no longer the same. And my in-laws didn't know or can't remember the password.
So I resetted the modem to factory setting. And viola! My VPN connection problems went away. I can't be sure if there was or wasn't something previous configured that caused the problem. But if you're having issues... it may be worth your while to try resetting the router... or just power cycling it.