Why Twitter.com not loading claiming self-signing certificate?

Hi 9rgeoc.

Can you click the Advanced button and paste here the certificate?

MIIElTCCA32gAwIBAgIBADANBgkqhkiG9w0BAQUFADCBjjELMAkGA1UEBhMCQ0Ex ETAPBgNVBAgUCFNUX0ROU0JMMREwDwYDVQQHFAhMTl9ETlNCTDERMA8GA1UEChQI T05fRE5TQkwxETAPBgNVBAsUCE9VX0ROU0JMMREwDwYDVQQDFAhDTl9ETlNCTDEg MB4GCSqGSIb3DQEJARYRZG5zYmxAZXhhbXBsZS5jb20wHhcNMTkwOTA1MTM1ODI1 WhcNMjkwOTAyMTM1ODI1WjCBjjELMAkGA1UEBhMCQ0ExETAPBgNVBAgUCFNUX0RO U0JMMREwDwYDVQQHFAhMTl9ETlNCTDERMA8GA1UEChQIT05fRE5TQkwxETAPBgNV BAsUCE9VX0ROU0JMMREwDwYDVQQDFAhDTl9ETlNCTDEgMB4GCSqGSIb3DQEJARYR ZG5zYmxAZXhhbXBsZS5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB AQDITpw1RxekcIW1MRBnjffWTS1F3Y6fBXJegY4znxJZYQlu8g81FDbhJiHIIL7P dBIvQVCjwd7WqbD/xgiyT8SOPOO0V7zQkP9fNSMt/+4+QCp3qCqhrGkCyYwFnVVY BqU9uCu8vyYB9BO8V+INSmf4SRQ4p30UtFLk/Ya2dtqeHWw60rCbeeFUpIqGPW94 L0nNXfb5Qo49vwsqWykxujJ+3DjIZ+DAF3C9LMP9yZt38CWVylb36woB4XCzs+V3 9sHNp8qqDtXmVzserH8ZgsAiv7eWg+vCMR5MnUpSTu8+4nwYkHWbMUENvVoUEPTL dT6Ts0L9MWJQn4NTIrp7kcPHAgMBAAGjgfswgfgwHQYDVR0OBBYEFEq83PsWJFtN RivOoN3LVS7UzJlRMIG7BgNVHSMEgbMwgbCAFEq83PsWJFtNRivOoN3LVS7UzJlR oYGUpIGRMIGOMQswCQYDVQQGEwJDQTERMA8GA1UECBQIU1RfRE5TQkwxETAPBgNV BAcUCExOX0ROU0JMMREwDwYDVQQKFAhPTl9ETlNCTDERMA8GA1UECxQIT1VfRE5T QkwxETAPBgNVBAMUCENOX0ROU0JMMSAwHgYJKoZIhvcNAQkBFhFkbnNibEBleGFt cGxlLmNvbYIBADAMBgNVHRMEBTADAQH/MAsGA1UdDwQEAwIBBjANBgkqhkiG9w0B AQUFAAOCAQEAOQ2s8ujig3ogMHxalohICQhYDnONBwb2p/CUcw3P8UWFdLFoE90F z0Y0su9nAlux/8Gg5GbLrI8FS7TQt+21tfvpEm6UyBL/8udm82+O4ej6L9D1AoGu iFogDQbzejmEn5C13vKhWMjbmXGMgTqWXtZGb/oM+csam3cgR2pW84cw1giZk6oW 5HA5vvoY652f1eweK3mdnDjvbIMkuL7LI5abgNhJfZU/RvFksSrJWOnwnO3fMjQS UqRD7CKJ2Xc+Z5zIWpvd9sRzGPGh7KVeIm4RUagIMRyok/4Nza3DGApFpmvCZH/J v2eGDa0iKm2osKAK3J2Ps4rWLwj6LTjyzg==

The certificate is issued by dnsbl, so if that does ring a bell then check out his software.

• Issuer: C=CA, ST=ST_DNSBL, L=LN_DNSBL, O=ON_DNSBL, OU=OU_DNSBL, CN=CN_DNSBL, emailAddress=dnsbl@example.com

You can check the connection settings.

• Options/Preferences -> General -> Network: Connection -> Settings

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

• https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

So cor-el, are you saying DNSBL issued the certificate? I do have DNSBL as a part of my firewall defense. I have also had no proxy in Firefox network connection.