I think the proxy from your browser setting can cause this error. I have experienced that some proxies can't handle secure connections.
You can find the connection setting from Firefox: Tools > Options > Advanced, Network tab : Click on Connection (check to make sure you have the right port for SSL connection. If you do not need to use a proxy to connect to internet then select No Proxy or set to auto detect proxy.
The root cause for this particular issue is a mismatch between the IP address being published for the domain between a client (PC broswer) and a server (NSS) and the IP address in Apache's httpd-ssl.conf file (Example: 127.0.0.2 (server) vs. 127.0.0.1 (client)). When the browsers (any browser) tried to do an https: type SSL connection, they were trying on port 127.0.0.1:443. Apache wasn't listening there and the fetch failed. This error is a common error when a mismatch on port number for SSL connection between client and server (if a broswer is set with a proxy- a default port is set but it can be any port determined by user which can cause this issue).
In your case, when a HTTP is connected and redirected for HTTPS port defined from NSS, your browser is using the port determined by NSS. Then everything is working fine. Your browser will be cached to the working port and it should be working fine. However, you may see this issue again if you are not resolve the port between client and server for SSL connection.
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