Join us to show up for other Firefox users 🦊. Earn fun badges and Mozilla swag vouchers! Find out more: https://mzl.la/askafox150

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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

why do i receive a "sec_error_unknown_issuer" when opening "https://www.icloud.com/" in firefox 13.0.1 ?

  • 3 replies
  • 5 have this problem
  • 88 views
  • Last reply by ideato
  • Solved

this is the message i receive (in dutch)

http://tinypic.com/r/35d87c5/6

this is the message i receive (in dutch) http://tinypic.com/r/35d87c5/6

Chosen solution

Check your firewall, because some firewalls monitor secure connections (https) and send their own certificate instead of the website's certificate.

http://kb.mozillazine.org/Firewalls

otherwise see if this happen in a new profile :

http://kb.mozillazine.org/Profile_Manager



thank you

Read this answer in context 👍 1

All Replies (3)

Chosen Solution

Check your firewall, because some firewalls monitor secure connections (https) and send their own certificate instead of the website's certificate.

http://kb.mozillazine.org/Firewalls

otherwise see if this happen in a new profile :

http://kb.mozillazine.org/Profile_Manager



thank you

You are welcome