Apache and M$ Internet Explorer seem to have a problem with not handling Persistant Connections correctly over https using http/1.1. If using a scripting language like PHP or ASP (chillisoft) on Apache you will sometimes get the "Page cannot be displayed" error on posts to other pages. This happens randomly and is a big pain in the ass to figure out. I finally found a fix for this on the cobalt-developers list. This line should go in your httpd.conf file in the section for your SSL virtual host.
The line you want is this: SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0
Keep it all on one line. Here is the full section from my Apache version 1.3 apache.conf file.
## ## SSL Virtual Host Context ## ServerAdmin firstname.lastname@example.org DocumentRoot /var/www/html/nowhere.com ServerName www.nowhere.com ErrorLog /var/log/httpd/nowhere.com-error_log CustomLog /var/log/httpd/nowhere.com-access_log combined SSLEngine on SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0 SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL SSLCertificateFile /usr/local/apache/conf/ssl.crt/www.nowhere.com.crt SSLCertificateKeyFile /usr/local/apache/conf/ssl.key/www.nowhere.com.key