ubuntu - SSL connection refused

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I'm getting "Connection refused"
errors for some sites being served over SSL on my Ubuntu box (10.04 LTS). It doesn't
affect all sites: https://github.com/, for example, loads no problem, but href="https://codeeval.com" rel="nofollow noreferrer">https://codeeval.com
does not.

I've checked my firewall settings, and
there are no rules affecting connection to sites over port 443. But running nmap yields
the following:

$ nmap
            -sT -r -n -p443 codeeval.com

Starting Nmap 5.00 ( http://nmap.org )
            at 2011-06-22 11:25 BST
Interesting ports on 184.72.48.116:
PORT
            STATE SERVICE
443/tcp closed https

Nmap done: 1 IP
            address (1 host up) scanned in 1.31
            seconds

To
check that it wasn't a problem with the site, I SSH'd into another computer on my local
network and ran the same command, this time
getting:

$ nmap -sT -r -n -p443
            codeeval.com

Starting Nmap 5.00 ( http://nmap.org ) at 2011-06-22
            11:37 BST
Interesting ports on 184.72.48.116:
PORT STATE
            SERVICE
443/tcp open https

Nmap done: 1 IP address (1
            host up) scanned in 0.53
            seconds

There's
clearly something wrong with my local config, but I can't work out what might be causing
it. I haven't been able to track down any meaningful log messages; the only response
when I try to connect is "Connection
refused."

Does anyone have any insight into what
might be causing this?

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class="normal">Answer

Actually,
I've found the solution. I followed the advice here - href="https://serverfault.com/questions/124831/ssh-connection-refused">SSH Connection
refused - which I assumed to be an unrelated
problem.

Clearing the IP tables and resetting
the rules fixed my
problem.

EDIT - A
follow up:

I've also determined
what caused the problem, though I'm now looking for a long-term solution. It would seem
that the changes made to my IP tables made by software called IPBlock persist even after
the application process has ended. The only way I can seem to prevent this is by
flushing the tables after I quit IPBlock. Does anyone have any better
suggestions?