Firebox T40 and Verizon Internet issue

Firebox T40 is being used as the main router. Comcast (wired) Internet connection is main Internet connection, and trying to add Veriozn (wireless) Internet as a secondary (failover) Internet connection.
When Comcast connection is used, there is no problem. However, when Verizon connection is used, the POS system, which relies on Internet connection, stops working, and some websites cannot be accessed while others can be.
What I noticed is that, if http, https proxies are bypasses by creating firewall rule in Firebox T40, the problem disappears.
Has anyone had an issue like this and figured out why it is happening?


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