What could be the possible reason?

[slybo]

I looked at the website and only found one model that was battery powered the PHS300 but it is a hotspot and could not find if it had a firewall. So you would have to use another model and the car power adapter.

[Zyndstoff (aka Steven Gail)]

I'll stick to my idea that if there's no other choice, a strong software firewall, fine tuned if needed, should be able to handle inbound connections properly and prevent intrusions, may be lukor should post something here, I'll mail him.

I agree.

[Dieselman]

If you must stick with a software firewall then your best bet is Comodo.

[Ashish Singh]

Well I find Outpost in many ways ahead to comodo. And how can comodo help me if a 21 years old boy from Iran hacked into its system and generated 4-5 Security Certificates ??

[Dieselman]

Well I find Outpost in many ways ahead to comodo. And how can comodo help me if a 21 years old boy from Iran hacked into its system and generated 4-5 Security Certificates ??

Nothing can stop an experienced hacker. But a hardware firewall is a must if you can get one. Comodo is also the most configurable 3rd party firewall around.