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Have you verified that you've Installed the root CA Chain (Certificate/Authority trust chain) for the CA that the site is using?<br />
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Because you're listing the system as a &quot;new machine&quot;, I'm leaning towards the CA chain may be the issue.
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Have you verified that you've Installed the root CA Chain (Certificate/Authority trust chain) for the CA that the site is using?

Because you're listing the system as a "new machine", I'm leaning towards the CA chain may be the issue.

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I solved the problem on my own.
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I have the following code snippet that runs fine on two machines, but not on the one I need it to run on.<br />
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use LWP::UserAgent;<br />
<br />
$ua = LWP::UserAgent-&gt;new(ssl_op<wbr />ts =&gt; {verify_hostname =&gt; 1 });<br />
$res = $ua-&gt;post(&quot;<a href="https://tradehouse.net/send/interchange" rel="ugc">https://tradehouse.net/send/interchange</a>&quot;, content =&gt; { request =&gt; &quot;$xmlout&quot; });<br />
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Depending on the setting for verify_hostname I get two different results.<br />
= 0 Bad hostname tradehouse.net:443<br />
= 1 Certificate verification failed<br />
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I'm running it successfully on win XP and Win 7. &nbsp;The problem machine is running Windows 7 and it's a new PC with very little else on it. &nbsp;Other than being on different networks, and running different firewalls (Comodo is on the machine that fails) Norton is on the machines that work, I don't see a lot of difference between the two installations.<br />
<br />
I'm using activestate perl. &nbsp;I've tried adding Mozilla::CA but that didn't make any difference. &nbsp;I've run out of ideas to try.
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I have the following code snippet that runs fine on two machines, but not on the one I need it to run on.

use LWP::UserAgent;

$ua = LWP::UserAgent->new(ssl_opts => {verify_hostname => 1 });
$res = $ua->post("https://tradehouse.net/send/interchange", content => { request => "$xmlout" });

Depending on the setting for verify_hostname I get two different results.
= 0 Bad hostname tradehouse.net:443
= 1 Certificate verification failed

I'm running it successfully on win XP and Win 7.  The problem machine is running Windows 7 and it's a new PC with very little else on it.  Other than being on different networks, and running different firewalls (Comodo is on the machine that fails) Norton is on the machines that work, I don't see a lot of difference between the two installations.

I'm using activestate perl.  I've tried adding Mozilla::CA but that didn't make any difference.  I've run out of ideas to try.

Perl LWP agent problems posting to https site

Perl is a high-level, general-purpose, interpreted, dynamic programming languages with over 25 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large-scale development projects.  Perl gained widespread popularity as a Common Gateway Interface (CGI) scripting language, in part due to its regular expression and string parsing abilities. In addition to CGI, Perl is used for graphics programming, system administration, network programming, finance, bioinformatics, and other applications.