There seems to be something wrong on the Outlook servers. Hopefully they fix this quickly on the server. I've see a few reports similar to yours and I can confirm it myself.

This looks like a problem with OCSP stapling on the server because it works when I disable this feature in Firefox.

• https://en.wikipedia.org/wiki/OCSP_Stapling
• https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/

You can temporarily toggle this pref to false on the about:config page to see if disabling OCSP Stapling works for you. It is best to reset this pref via the right-click context menu to true once you are done with the this website.

• security.ssl.enable_ocsp_stapling = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

so how can I report this issues to outlook.com, Outlook.com? Or will you report this problem to Mozilla Firefox or Outlook.com?

microsoft is already aware of their server misconfiguration and is in the process of fixing it - so hopefully outlook will start working normally again soon.

Do you know how long it will be before it works?

                       Thank you.

i'm not sure about that and it may not help that it is a holiday today in the US.

in order to work around the issue that as cor-el has suggested, please enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named security.ssl.enable_ocsp_stapling. double-click it and change its value to false - this will degrade a security feature in firefox, so please revisit it in a couple of days again after microsoft has fixed their stuff and turn it back on again then...

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem.

An error occurred during a connection to outlook.live.com. Invalid OCSP signing certificate in OCSP response. Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT

Report errors like this to help Mozilla identify and block malicious sites

{ It tell you to Report errors tp mozillia and block Malicious site ?

Hi

Thank you for mentioning this.

In this instance we know what is causing this issue, as mentioned in previous responses.

it now working. I can get into my e-mail without no problems. so I think my problem is solved.

There are still some affected servers around, but for most this should be fixed.

• https://portal.office.com/servicestatus

If it works in Firefox with OCSP Stapling enabled then leave/restore security.ssl.enable_ocsp_stapling set to true since this is a security feature.

• https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/