@Tapas133 Ok, then let's try to extend the hotspot of your own smartphone first. I suggest you perform a Factory Defaults Restore on the C20 and then go through the Quick Setup again and apart from...

@Tapas133 Hi, What kind of hotspot are you trying to connect to? If you connect to that hotspot with a smartphone or computer, are connected to the Internet right away?

@n00b-2005 Is it actually possible to "ping" the WAN IP address of your Archer A5 router from another device on the Internet? (you may have to allow ping from WAN port via the menu Security ->...

@Robull I haven't used PPTP VPN for years, but I think forwarding of Port 1723 / Protocol TCP should should be enough, although some say that Port 47 / Protocol ALL (or actually "GRE", if it's...

@n00b-2005 Perhaps it's very unlikely, but can you check if you may have activated the DMZ host feature (in the menu "Forwarding") at some point and later forgot about it?

@n00b-2005 One more thing you could try is to change the "Web Management Port:" in the A5's Remote Management configuration page to some other number, in case that your ISP is somehow blocking port...