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ntpdate and firewall: no server suitable for synchronization found

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http://serverfault.com – I'm behind a firewall and only have access to ports 80 and port 443. How can I sync my system's clock? Here's the command I issue: sudo ntpdate -u 1.debian.pool.ntp.org But I keep getting the following error: no server suitable for synchronization found. Is there some other program that can sync over port 80/443? Or is it possible to get ntpdate to work on these ports? Many thanks in advance, (HowTos)