The following search might be able to find the configuration file that sets the proxy:
Code:
grep -r "proxy.iogs" /etc
If that does not find anything, look into your .bashrc / .profile config files, maybe the proxy is set via environment variables:
Code:
grep -r "proxy.iogs" ~/.*
The -r stands for recursive. For the search in your home directory you might want to omit it in the first go for faster results. In a second attempt, add it to also search directories such as ~/.config.