guster@guster-HP-Compaq-nc4400-RL880AW-AB1:~$ curl
https://icanhazip.com/curl: (6) Could not resolve host: icanhazip.com
I think the (6) means it's trying to use your ipv6 interface, but you don't have dns configured on it.
See if adding -4 (see below) works for you. Then try the -6 (as below)
I may have to patch dashman to avoid misconfigured ipv6 interfaces:
$ curl -4 https://icanhazip.com
178.62.165.211
$ curl -6 https://icanhazip.com
2a03:b0c0:0:1010::4f:a001