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Our university uses Sonicwall to block certain sites and each student can log into the internet through it.

Its hard to download big files like a linux distribution iso in a single go and I don't want to stay up all night downloading a file. Is their some way by which I could automate this logging in process. Also we get disconnected after every three hours and must log in again.

More generally what scripting language or technique should I learn about so as to achieve this. I prefer ruby over others so if its possible in ruby then its an added bonus.

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You could, at least, try asking the Uni SysAdmins if they could download it for you rather than trying to find a work-around. –  tombull89 Aug 31 '11 at 14:33
Is Sonicwall an actual program, or are you prompted to log in by your web browser? –  Breakthrough Aug 31 '11 at 16:03
Welcome to Super User! Sorry, but bypassing policies set up by educational organizations is not what we want to discuss here. If you need to log in every three hours then there is probably a reason to that. Consider contacting your network administrator or finding an alternative way, unless you want them to get angry if they notice your high bandwidth use at one or another time. –  Tom Wijsman Aug 31 '11 at 18:06
@Breakthrough: It's a hardware firewall, something people don't want to mess around with... :) –  Tom Wijsman Aug 31 '11 at 18:07
@Tom Wijsman that's fine, but does it require a third-party utility to be installed on the computer to log into the firewall, or does it simply prompt you for a username and password when you fire up your web browser? –  Breakthrough Aug 31 '11 at 18:17
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