The problem is:
Tplink => WAN => LAN bridge WIFI
There is only internet. but does not access https://secure.etecsa.net:8443
The problem is here, between the WAN and the LAN, which does not allow opening the website https://secure.etecsa.net:8443, either from the LAN or through the WIFI
I had a suspicion that it might be a closed port. I have tried to open port 8443 in several ways, but for some reason I failed. looking for information I found a list of ports and their functions I saw that port 8443 is not an official port, although it can be used.
I began to think about the error that the browser gave that made references to DNS and the idea came to me to open the port that has to do with DNS in this case 53. Well to my surprise the problem was solved.