这个论坛证书过期错误，好几年了，也不知道这是不是真论坛

[QWEASSD]

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Websites prove their identity via certificates, which are valid for a set time period. The certificate for forums.internetfreedom.org expired on Sunday, October 30, 2005.

Error code: SEC_ERROR_UNKNOWN_ISSUER

[TinkerBell]

可能这个论坛并没有使用HTTPS，比如说那个证书是自签名的，所以浏览器会有安全风险提示。

[jingyue]

可能这个论坛并没有使用HTTPS，比如说那个证书是自签名的，所以浏览器会有安全风险提示。

这个论坛使用了 https ，所以，本论坛 https 加密链接还是起作用的，
应该是象你说的情况，"那个证书是自签名的"，