Nah, this is not really a tech support community, but whatever. (Unless it is a tech support community? I always thought pcmasterrace was supposed to be a hair on the sarcastic side.)
It looks like a self-signed cert that is on your DSL modem (The subdomain was 'dsldevice'....) and I am guessing you are trying to use the web interface for your modem?
If you aren't making a connection to that device (which would have an IP address in 192.168.x.x, 10.x.x.x or 172.16.x.x) and you are trying to browse to an external site, then:
There is no internet connection and your device is injecting a local address for an external DNS query to give you a hint that you need to fix yo' shit or
Your device is super old and cannot handle HTTPS correctly. (Unlikely)
Your DSL device is hijacked and is doing an MTM attack on a HTTPS connection. (Highly unlikely, but you never know.)
Do regular web sites work correctly, or does this happen regardless of the site you are attempting to browse to?