hi, first please make sure that the date, time & timezone are set correctly on your system. if this doesn't solve the issue (or it is already set properly), a solution depends on the individual circumstances:

• what is the error code shown when you click on advanced on that error page?
• please also give us more information about the error by clicking on the error code, copying the text to the clipboard and then pasting it here into a reply in the forum like shown in the screenshot.

thank you!

date ,time, timezone is set properly error code : sec_error_unknown_issuer all web sites show this error

https://www.yahoo.com/

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: false HTTP Public Key Pinning: false

Certificate chain:

MIIGczCCBVugAwIBAgICFj8wDQYJKoZIhvcNAQELBQAwaDELMAkGA1UEBhMCQ1ox DzANBgNVBAgTBlByYWd1ZTEOMAwGA1UEChMFQVZBU1QxHTAbBgNVBAsTFFNvZnR3 YXJlIERldmVsb3BtZW50MRkwFwYDVQQDExBBdmFzdCB0cnVzdGVkIENBMB4XDTE3 MDUxOTAwMDAwMFoXDTE3MTAxNzEyMDAwMFowXjELMAkGA1UEBhMCVVMxCzAJBgNV BAgTAkNBMRIwEAYDVQQHEwlTdW5ueXZhbGUxFDASBgNVBAoMC1lhaG9vISBJbmMu MRgwFgYDVQQDDA8qLnd3dy55YWhvby5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IB DwAwggEKAoIBAQC+0AEkIZq2uEhecyC3GIClLvLt63tWM4MUC43+lXiAFOZqv+aK fkBfg4t4rTnk19OxF/swl9g2FSbMisiEi4vHMGSOrCXqv43RLXKeF+/bfTSNcVK7 tYeZ3MZyMT0nCWxadkpm9k7SIEWBZAKcpft+ywJ3hUghKPpiO3btZVfxSxMdexe/ JyECZDTwRzHILmNBXcjMr7FFASeqvd5+hCsCoy2UMchfBI1RLJy5gHy+QWllvy/v Tsgzy9Y3J2R5Q3fVaBGLi/3kxd3a+irDX2fJ4B5gIlV0WaFI7GoMeoUb/cTwfG7X RRKPa6HG9IJhwHA33pgdJiJbHd5TOg9UpQ1ZAgMBAAGjggMvMIIDKzAdBgNVHQ4E FgQUdc5VxqWsx+5bP16BVGZ9nimamqMwHwYDVR0jBBgwFoAU4Rl1+RxGIg0fP6ac ambr/ZAmviEwggLnBgNVHREEggLeMIIC2oIPKi53d3cueWFob28uY29tghBhZGQu bXkueWFob28uY29tgg8qLmF0dC55YWhvby5jb22CDWF0dC55YWhvby5jb22CDGF1 LnlhaG9vLmNvbYIMYmUueWFob28uY29tgg1icmIueWFob28uY29tggxici55YWhv by5jb22CD2NhLm15LnlhaG9vLmNvbYITY2Eucm9nZXJzLnlhaG9vLmNvbYIMY2Eu eWFob28uY29tghBkZGwuZnAueWFob28uY29tggxkZS55YWhvby5jb22CFGVuLW1h a3Rvb2IueWFob28uY29tghFlc3Bhbm9sLnlhaG9vLmNvbYIMZXMueWFob28uY29t gg9mci1iZS55YWhvby5jb22CFmZyLWNhLnJvZ2Vycy55YWhvby5jb22CEmZyb250 aWVyLnlhaG9vLmNvbYIMZnIueWFob28uY29tggxnci55YWhvby5jb22CDGhrLnlh aG9vLmNvbYIOaHNyZC55YWhvby5jb22CF2lkZWFuZXRzZXR0ZXIueWFob28uY29t ggxpZC55YWhvby5jb22CDGllLnlhaG9vLmNvbYIMaW4ueWFob28uY29tggxpdC55 YWhvby5jb22CEW1ha3Rvb2IueWFob28uY29tghJtYWxheXNpYS55YWhvby5jb22C DG15LnlhaG9vLmNvbYIMbnoueWFob28uY29tggxwaC55YWhvby5jb22CDHFjLnlh aG9vLmNvbYIMcm8ueWFob28uY29tggxzZS55YWhvby5jb22CDHNnLnlhaG9vLmNv bYIMdHcueWFob28uY29tggx1ay55YWhvby5jb22CDHVzLnlhaG9vLmNvbYIRdmVy aXpvbi55YWhvby5jb22CDHZuLnlhaG9vLmNvbYINd3d3LnlhaG9vLmNvbYIJeWFo b28uY29tggx6YS55YWhvby5jb22CDXplZC55YWhvby5jb20wDQYJKoZIhvcNAQEL BQADggEBAFYt7OOnn65NPfQUeSJZacqc86ENZ+TmPVng+acWKMY0XiEPlV+Mhrxr GdoFbKGjo6f96XHuKgRJ87sN08iDlHaw5A+THyXZC+RGcJZluVODL29nC4Pdhae1 QEMVXd142iqo10Uwf+2pw8L4H5raXQU4LDJ4b/s3FuTH+t7Jz5wy0Zu24l/lQg6H 8k5cH7h+xU/e3IGincCyUqUE2lnuCU/O+2kn30UdbD0gYfyhAfXQesqYMJekY70t SRg4nepY2xOKdl9H34DJairxJie7wTBbMrovAbIzC66HT/bg3OsHdkaEM4dvnyMd 6F8PeMmDwvLMyI1cEZ+V+43BM//pkKo=

thanks, it looks like your avast software is meddling with secure connections - it's best to disable the scanning of secure connections in its webshield preferences...

I'M SORRY BUT I DO NOT KNOW HOW TO DO WHAT YOU SAID TO DO.

i only found an instruction for how to do it for the windows version on avast's website, but i think it should look fairly similar on mac as well: https://www.avast.com/faq.php?article=AVKB189

philipp said

i only found an instruction for how to do it for the windows version on avast's website, but i think it should look fairly similar on mac as well: https://www.avast.com/faq.php?article=AVKB189

THANK YOU SO MUCH!!!!!!