Gappproxy is used as the proxy, but when logging on to echofon, "api.twitter.com: 443" always pops up and uses an invalid security certificate. This certificate fails to log on because it is not trusted in the dialog box of sec_error_unknown_issuer due to the location where the certificate is issued. After searching, you can try to manually add the API address to the Trust List. Take Firefox 4.0 as an example (3.6 is similar). The specific practices are as follows:
SelectOption-> advanced-> encryption-> View Certificate-> server-> Add exception
In the pop-up dialog box, enter api.twitter.com: 443 in the address bar, click "Obtain certificate" on the right, and click "confirm security exception" below. Note the "permanently save this exception" box.
The following lists other addresses with similar issues. You can add them to the Trust List manually according to the above method.
Si1.twimg.com: 443
Static.addons.mozilla.net: 443
Api.xmarks.com: 443
Sync.xmarks.com: 443
Buy.xmarks.com: 443
Xmarks.com: 443
S-static.ak.facebook.com: 443
Ssl.gstatic.com: 443