Hi,

I can open it with Firefox.

If Firefox has saved an outdated or untrusted certificate, removing it may fix the error. Click the menu button and select Settings. Go to the Privacy & Security panel, go down to the Certificates section, click View Certificates…, select any untrusted or outdated site certificates, and click Delete or distrust…

Does that help?

Thanks information. Doesn't let me click Delete or distrust.

Hi

Does this support article help?:

https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect

For me, that address redirects to

https://webmail-oxcs.register.com/appsuite/

Can you load that one?

The PR_END_OF_FILE_ERROR generally indicates that Firefox did not get any matching encryption ciphers from the web server. Since I am not getting this error, I don't think the problem is that nobody's Firefox can connect, but that for some reason, your Firefox can't connect. Hmm, why might that be? Some possible issues to consider:

(A) If you are using a VPN when accessing these sites, try without the VPN.

When you are using a VPN, an intermediate device sets the parameters of the connection to the web server. If you need the VPN, try selecting a different server or exit node in your VPN software.

(B) If you customized any connection-related preferences in about:config (especially ones that start with security.ssl or security.tls), you might need to reset these to their default values.

(C) Maybe your requests are modified by an intermediary (such as a proxy server, your security software, or an interloper)

Although most people are not intentionally using a proxy server, Firefox may discover one set up in your system settings. Sometimes forcing Firefox to ignore those settings helps with weird connection issues. Here's how:

Open the Settings page using either:

• "3-bar" menu button > Settings
• (menu bar) Tools > Settings
• type or paste about:preferences into the address bar and press Enter/Return to load it

In the very tiny search box at the top of the page, type proxy and Firefox should filter to the "Network Settings" section of the page.

Click the Settings button, change the top setting to "No Proxy" and then click the OK button at the bottom of the dialog to save your change.

Any difference?

Thanks for all the help. My problem is solved.