Mac OS X Server Firewall Serial Hole
Those wacky kids at Macintouch have noticed Mac OS X Server 10.4 scopes the local network looking for duplicate serial numbers. Nothing outrageous, typical fare for commercial software.
What they haven’t noticed yet is Mac OS X Server 10.4 overrides an explicit administrator firewall security setting to keep its copy protection functional.
OSXS 10.4’s “Server Admin” lists “Serial Number Support” on UDP port 626 under its firewall pane, with an option to turn it off. You can, in fact, block that port with the UI. And it will work for a little while. rentzsch.com: Mac OS X Server Firewall Serial Hole
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