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TCP ports - changing

Hello TCP experts,

This may be a dumb question. Suppose I have an application that listens on TCP 3012. Suppose I want to secure it with SSL. I know of a handful of TCP ports with SSL "flavors" (ldaps, imaps, pop3s, etc).
I was thinking if I change the app to listen on, let's say, tcp 636, would I then be able to secure it with an SSL Cert? I guess what I'm missing is, are port #s, just numbers or is it the behavior of the traffic that defines the port #?
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trojan81
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trojan81
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1 Solution
 
trojan81Author Commented:
Giving it a second thought and I think simply configuring your application to listen on a known secure port over SSL doesnt do any good if the application is not configured to negotiate encryption with the client. Is that a correct assumption?
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theras2000Commented:
Yes that's correct.  You can just change your port and expect your application to automatically encrypt traffic.

Also correct is your saying that a port is just a port.  You can run any app/protocol over any port you like.  The reason people stick to recognised ports is so that we can find each others' services.  If a public website suddenly started using port 6000 instead of 80, then nobody's browser would find their site.  443 is the recognised port for HTTP/SSL.  993 is the recognised port for IMAP/SSL.  We pick what port we want, but then we must make sure our clients know what it is.
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trojan81Author Commented:
Thereas2000

Your comment "Yes that's correct.  You can just change your port and expect your application to automatically encrypt traffic."

Did you mean to say You CAN'T or you CAN
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theras2000Commented:
Do'h!  You CAN'T.  Sorry about the typo.
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