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A comment on UK Teen Hacked 150,000 Printers. Parent comment
Is Port 5222 required inbound for the print server? No, only 5222 outbound is required.
443 TCP (HTTPS), with connections to: https://www.googleapis.com/* https://accounts.google.com/* https://www.google.com/cloudprint/*
5222 TCP (XMPP, using STARTTLS), with a persistent connection to: talk.google.com
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Is Port 5222 required inbound for the print server? No, only 5222 outbound is required.
443 TCP (HTTPS), with connections to: https://www.googleapis.com/* https://accounts.google.com/* https://www.google.com/cloudprint/*
5222 TCP (XMPP, using STARTTLS), with a persistent connection to: talk.google.com