Background
ISP - AT&T, wireless modem, uverse
router - SonicWALL TZ 215 current firmware.
Issue
About a month ago, we upgraded the firmware in the SonicWALL, after a few days the users ran into an issue with trying to get to https://taxnet.ides.state.il.us/Login/Login.aspx?ReturnUrl=%2flogin%2f or anything to do with a similar domain. All other Illinois state sites seem to work. All other states websites work, no other sites are affected.
We checked all computers on the network, they have same issue.
we plugged a laptop that had the issue going thru the network, we then hooked same laptop directly to the ATT modem, going around the SonicWALL, site comes up.
That seem to point to something on the SonicWALL, we then factory reset the SonicWALL, retested with factory settings and the public static address, still no go.
I then obtained another...