An LTS installation was already hacked once. Now they are at it again. It's a 4 hour round trip for me to the venue. It's an LTN8616-P16. About twenty illegal login attempts from the same IP address, (supposedly a Verizon phone customer by whois) in the last 24 hours. They don't seem to be getting in yet. After the last attack I was able to find upgraded firmware going from 3.4.96 to NVRK_V4.30.005_210222. I did not find it from LTS Us, it was on LTS Australia. I wonder if that is stopping them and the backdoors are no longer in this version of firmware? But I was looking for IP filtering in this version and it's not there. I have some Dahua venues and their software has the IP Right function that has stopped all the problems through filtering. There does seem to be a V4.40xx available, but it actually has an earlier date, so I don't know if applyiing that will be any more help. I don't mind getting used to Illegal login alerts if their not getting in, but I'd like to filter someway. I know Port Forwarding is not optimum for security and I'm researching options. But I'm hoping this site can possibly provide some answers that LTS doesn't. Mainly I guess is "Have these later firmware versions addressed the brute force or backdoor issues or not? Thanks for any help here.