Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT >> Whats going on i cannot access Outlook Hotmail & are not receiving E-mails from Firefox to verify my account

  • 4 replies
  • 33 have this problem
  • 1 view
  • Last reply by garrywm30

garrywm30
garrywm30
more options

I cannot access Outlook Hotmail via firefox ? { Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT } started 28/5/17 . Also am Not receiving Mozilla Firefox Verification E-Mails in my hotmail address . Have checked Spam and inbox nothing happening ?

I cannot access Outlook Hotmail via firefox ? { Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT } started 28/5/17 . Also am Not receiving Mozilla Firefox Verification E-Mails in my hotmail address . Have checked Spam and inbox nothing happening ?

Chosen solution

hey, it's about:config with a colon (see screenshots).

Read this answer in context 👍 10

All Replies (4)

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...

garrywm30
garrywm30 Question owner
more options

When I enter About.config into address bar there are no preference settings showing . Ie do I have another way to get to security.ssl.enable_ocsp_stapling. Step by step would be good .

philipp
philipp
  • Moderator
more options

Chosen Solution

hey, it's about:config with a colon (see screenshots).

garrywm30
garrywm30 Question owner
more options

Thank you that fixed it .