I’ll get the same at my Beryl (snapshot Firmware).

Does ‘router/hello’ works for you?

lupus@kira:~$ curl -k https://192.168.8.1/cgi-bin/api/router/hello -X GET -H "Content-Type: application/json"
{"init":true,"connected":true,"configured":true,"version":"3.215","firmware_user":"","firmware_type":"","model":"mt1300","mac":"94:83:c4:xx:xx:xx","type":"router","name":"","code":0}

I don’t think it is a SSL issue, because http:// give the same result.

On my SlateAX, I get as result only ‘403 Forbidden’. But I have no time to find the right switch, right now. I’ll try this weekend, again.


Edit:
HINT: Don’t use !! in your Password. At least Linux Bash will expand !! to ‘last command’. Very disturbing.

Else it is working on Beryl with the explaination from @alzhao.