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- Putty and dynamic port forwarding (SOCKS)
- Laird Nelson
October 1, 2003, 7:15 pm
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* Development snapshot of putty downloaded today
* A helpful host Out In The World running an sshd on port 443
* An HTTP proxying firewall that only allows HTTP connections out on
port 80, and HTTPS connections out on port 443
* Me, stuck behind said proxy
I've got normal port forwarding working fine for this situation (for
example, I'm forwarding a local port to my POP mail server using this
setup), so I'm aware of how that works.
However, I just noticed today that the latest version of putty has
dynamic port forwarding--i.e. functions as a SOCKS4 proxy, apparently.
Curious to try it out, I added a dynamic port forward to my session
configuration in addition to the local ports I'm already forwarding.
Following the documentation, I added port 1080 as a dynamic port.
However, when I tried to hook up, for example, Yahoo instant messenger
using localhost port 1080 as a SOCKS4 proxy server, the program cannot
Am I doing anything obviously wrong? I'd like to set this up so that,
for example, I can tell my SOCKS4-proxy-aware mail reading software
(Mozilla) that the mail account is actually NOT located at
localhost:7025 (the static local port I'm currently forwarding), but is
at myhost.com:25, letting the SOCKS4 proxy (Putty, in this case) take
care of the connection details.
Thanks in advance,
Re: Putty and dynamic port forwarding (SOCKS)
Hmm; it looks like the problem resides with Yahoo messenger: it tries to
validate my IP address, but the validation fails because? presumably?
I'm behind the firewall. Here's an excerpt from the ypager.log:
On 10/1 16:16:19| Validate IP fails, localhost
So it looks like Putty is indeed serving as a SOCKS proxy.
Anyone know how to defeat the IP validation failure?
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