Setup to allow internet users to access an internal IP device

Hello,

I need help configuring a talktalk (Huawei) super router HG635 to allow general public on the internet to access an internal server in the LAN i.e. Port forwarding.

I have done all the settings i can thing of but still not accessible from outside internet: opened ports 80, 443, 22; did port forward as advised i think, DMOZ, NAT but it works if tested with another internal PC but not from outside.

You must be familiar with the TalkTalk Huawei super router and have experience in Network engineering. It's just about the final ticking.. just fine tuning my settings or spot my mistake. So I can't pay more than what's on offer as it's a quick check for someone who knows what he is doing.

I have Anydesk & Teamviewer installed.

Thanks