This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Cannot open Outlook email

  • 3 replies
  • 20 have this problem
  • 4 views
  • Last reply by Happy112

RSmyth
RSmyth
more options

Hi out there - I can't open Outlook email, hope somebody can help. I've cleared the cache and deleted the bookmark, but when I type https://outlook.live.com I am seeing this message every time: "SECURE CONNECTION FAILED - An error occurred during a connection to mail.live.com. Invalid OCSP signing certificate in OCSP response. Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT"

Hi out there - I can't open Outlook email, hope somebody can help. I've cleared the cache and deleted the bookmark, but when I type https://outlook.live.com I am seeing this message every time: "SECURE CONNECTION FAILED - An error occurred during a connection to mail.live.com. Invalid OCSP signing certificate in OCSP response. Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT"

All Replies (3)

philipp
philipp
  • Moderator
more options

hi, unfortunately MS has misconfigured a security feature (OCSP stapling) on their servers which got now cached in your local firefox installation.

in order to resolve that, 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...

RSmyth
RSmyth Question owner
more options

Thanks Philipp. I hope Microsoft address this quickly if degrades Firefox security. (I also hope it has nothing to do with the pop-ups I'm getting from Microsoft advertising their own browser.)

Happy112
Happy112
more options

Your system details show that you have two versions of Shockwave Flash installed. Having more than one version of a program may cause issues. You must remove the older program,   and then get the current full installer.

Flash: Grab the uninstaller from here: https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

Then reinstall the latest version.

Flash Player Version: 25.0.0.171

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the active_x.

https://get.adobe.com/flashplayer/

Note: Optional offer: McAfee Security