@Aeternam
As Jeroen3 says, you are misunderstanding how ports work.
Sorry but Jeroem3 has it backwards.
@Aeternam got it correct in terms of how ports work and how any reasonable network admin would approach configuring a firewall.
Standard firewalls care don't about outgoing traffic that much. Sometimes they can block a specific outgoing protocol. (based on dstport) Blocking dstport 80 is something I have never seen before. Most of the times a proxy is installed with filtering if blocking web content is the goal. Or even worse, a filtered DNS. It's an especially outdated method since a lot of websites use dstport 443 today.
My reply was based on the common misconception on ISP-forums that people need to port-forward tcp80 to their pc/xbox for "internet" to work.
Not knowing the knowledge of voltsandjolts, we could be sending him to the network guy asking for something similar to blinker fluid.
@Jeroen3
Ooooo, this might be the jackpot. It even says Firewall Friendly! Now to test if I can get OpenVPN outbound from here....
Indeed. We use it to plug into any random network our mobile analyzer is temporarily mounted. If there is no network, we use cellular. And since cellular used carrier grade NAT, you can't use server concepts on this side of the link.
OpenVPN is rarely blocked since you'll need at least an medium-bearded-IT-guy to be experienced enough that he blocks it. Those are rare.