Paypal Module IPN Handshare error whmcs 5.4.11

[Vs Nu]

Hello,

From past 5 days im facing Paypal automation issue while checking gateway log it was showing IPN Handshare error..i have searched this forum and some peoples mentioned curlssl should be enabled on the server it was enabled too...

 

I have pasted the log please refer it and help me :

 

<!--
instead of REQUEST_URI, we could show absolute URL via:
http://HTTP_HOST/REQUEST_URI
but what if its https:// or other protocol?

SERVER_PORT_SECURE doesn't seem to be used
SERVER_PORT logic would break if they use alternate ports
-->

<h1>404 Not Found</h1>
<p>The server can not find the requested page:</p>
<blockquote>
www.paypal.com/cgi-bin/webscr (port 443)
</blockquote>
<p>
Please forward this error screen to www.paypal.com's
<a href="mailto:webmaster@server.example.in?subject=Error message [404] 404 Not Found for www.paypal.com/cgi-bin/webscr port 443 on Saturday, 18-Jul-2015 08:17:25 IST">
WebMaster</a>.
</p>
<hr />
<address>Apache/2.4.12 (Unix) OpenSSL/1.0.1e-fips mod_jk/1.2.37 mod_bwlimited/1.4 Server at www.paypal.com Port 443</address>


<!-- end content -->
</div>
</body>
</html>

Please help me how to resolve this