➜  ~ nmap -Pn -p 8080 GLOBAL_IP
Starting Nmap 7.70 ( https://nmap.org ) at 2018-06-20 23:27 EDT
Nmap scan report for REDACTED.dyn.optonline.net (GLOBAL_IP)
Host is up (0.032s latency).

PORT     STATE SERVICE
8080/tcp open  http-proxy

Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds
➜  ~ proxychains nmap -Pn -p 8080 GLOBAL_IP
[proxychains] config file found: /etc/proxychains.conf
[proxychains] preloading /usr/lib/libproxychains4.so
[proxychains] DLL init: proxychains-ng 4.12
Starting Nmap 7.70 ( https://nmap.org ) at 2018-06-20 23:27 EDT
[proxychains] Strict chain  ...  127.0.0.1:9050  ...  GLOBAL_IP:8080 <--socket error or timeout!
Nmap scan report for REDACTED.dyn.optonline.net (GLOBAL_IP)
Host is up (130s latency).

PORT     STATE  SERVICE
8080/tcp closed http-proxy

Nmap done: 1 IP address (1 host up) scanned in 125.44 seconds
➜  ~