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A comment on Port knocking. Parent comment

Re:Port knocking by chx on Friday May 15, 2020 @02:39AM (#23189572)
There's a similar , very sneaky tool: sslh. Practically no automated tools will attempt to SSH into the HTTPS port...
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Re:Port knocking by GordonS on Friday May 15, 2020 @05:06AM (#23190256)
I presume this connects SSH clients, and serves a fake web page to browsers?

Sounds pretty cool, but do SSH clients (e.g. PuTTY need special support for it)

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Re:Port knocking by exrook on Friday May 15, 2020 @06:21AM (#23190598)
Nope, no support needed. SSLH will proxy SSL traffic to whatever other SSL service you have running (nginx, openvpn, etc.), and send the SSH traffic to openssh. It look like it even supports recognizing plain HTTP traffic as well and proxying it accordingly.
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