I have a IBM HMC (Hardware Management Console) that I needed to connect but I was receiving an error message about SSL/TSL
This page can’t be displayed
Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to https://172.16.2.26 again. If this error persists, it is possible that this site uses an unsupported protocol or cipher suite such as RC4 (link for the details), which is not considered secure. Please contact your site administrator.
Unable to Connect Securely
Firefox cannot guarantee the safety of your data on 172.16.2.26 because it uses SSLv3, a broken security protocol.
Advanced info: SSL_ERROR_UNSUPPORTED_VERSION
To solve this problem, you need to update the device you’re connecting to, since SSL v3 is not supported anymore.
Other work arounds:
Install an older version of Mozilla Firefox. Mozilla Firefox needs to be older than version 34. There is a portable version of Mozilla Firefox, Portable Edition that it is intended to be run from a pen drive. Unpack the application to your hard drive and run.
Run a virtual machine running Windows to run an older version of Internet Explorer
The correct way to solve is to regenerate a new certificate on the device you’re connecting to.
Or to update the firmware of this device.
If it is not possible, enter in this folder and delete these two files
Restart Firefox. Try again and if it doesn’t solve, remove all the certificates on Firefox options.
You may also want to install this extension Skip Cert Error. Access the page and don’t do anything when Firefox asks you what to do with the certificate. It will skip the confirmation for self-generated certificates. Valuable for the IT professionals. Since you won’t be adding the certificate permanently, this error won’t show again. Remember to check the option “has domain mismatch”
You can also check if this applies to your situation Firefox Error code: sec_error_ca_cert_invalid
Error code: sec_error_reused_issuer_and_serial
Bug 435013 – Cert error “sec_error_reused_issuer_and_serial” (e.g. for Linksys devices) cannot be overridden