Hi gary_dexter,
I checked with the Norton ConnectSafe team. It is possible that you ISP is not allowing the 199.xx addresses. The same nodes that serve 199.xx also serve 198.xxx, so we shouldn't see a difference at all here. Is it possible that you could reach out to your ISP to see that could be the reason?
The 'old IS' starting with 198.xx are exactly the same as the 199.xxx IPs. The 19.xxx set will continue to work and will not be retired. Please use the 198.xx set.
Thanks,
Katie