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You cannot block port 80 like you imagined. The web would not function normally. HTTP uses port 80 both for data and control.
by anticensor 7y ago
You cannot block port 80 like you imagined. The web would not function normally. HTTP uses port 80 both for data and control.
- MertsA 7y agoIt's extremely common for ISPs to block inbound packets with a destination port of 80, 443, 25, etc. Of course they don't block them outgoing (with the exception of port 25 commonly). He didn't "imagine" anything and it's quite out of form on HN to claim something like that.
- anticensor 7y agoPort 25 is SMTP, it needs to be allowed in outgoing direction. Otherwise you will be locked to proprietary web mail.
- namibj 7y agoThere's a dedicated SMTP submission port. Try dialing e.g. gmail's MX record on 25. It might/should probably block.
- anticensor 7y agoIf you mean port 465, it is the port for SMTPS, not a dedicated submission port. I received timeout, not block, when I queried gmail on port 25. If it were blocked, I would get a TCP reset.
- vidarh 7y agoPort 587. Not nearly all consumer isps block port 25, but a lot do.