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A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.
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And where from do you checking ports accessibility on wan interface , from LAN or from WAN?
You need just use "Virtual Server" section in router 820L setup provide there an ip address from DVR, ports it use, and protocol (if You not shure, choose "Both" there) Also, be shure that the checkbox at this rule is active. And may be, You have to open this ports in filter section of firewall: Input from WAN to router opened ports must be Accept, And Forward from local ip of DVR must be ACCEPT, Also, You can try to configure "SNAT to DVR local IP ACCEPT" in firewall rules of router.
At DVR You have to provide default gateway (Access to Internet throught Your router 820L)