At the website, change the MAC to all zeros or what ever is closest that it allows, use the colons in proper places too.
Then save that and reset. Then redo it with correct MAC and reset that.
If you get limited out with number of resets, send me a private message with numbers and I can bypass that limit for you.
let us know
This looks like maybe a DNS thing.
Test that by using a public Google DNS
Do that thru your router.
Can google search a tutural for that. There are some easy to follow tuturals out there.