I think you are all misunderstanding my question…I am asking about why a home firewall set to high security is blocking me accessing my vps in a datacenter elsewhere in the world…ie outside network.
What this means is that clearly my virtualmin system (which is in a datacenter) is not meeting the security requirements for a home router firewall set to “high”. If I lower my home/office firewall setting to “normal”, my vps virtualmin url (https://domain.com:10000 in datacenter is not blocked.
So when home network firewall is set to “high”, I also cannot log into Usermin, i also cannot send emails through my server using any device connected to my home office network even when using mail clients such as Outlook or Apple mail. However I can still log into on web browser and send emails using traditional hotmail or yahoo mail accounts…but not postfix accounts hosted in virtualmin.
I know that I can simply add an exception to firewall, however i am more interested in ensuring my virtualmin vps meets standard firewall expectations. I am being suspiciously cautious it doesnot meet the expectations of home firewalls whenever they are set to “high”
Is it the server SSL certificate? Is it something else about the server such as a custom port which is not tcp port 80? (because even usermin when accessed via a browser is using non standard port yes?)
What criteria do firewalls use to automatically filter based on such settings as “low”, “normal”, “high”? I want my server to meet “high” firewall packet filtering expectations