This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

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

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

Most sites will not connect due to security issues

  • 2 respostas
  • 4 have this problem
  • 526 views
  • Last reply by david.carlip

david.carlip
david.carlip
more options

I am running Firefox 126.0-1 on an Arch Linux system. Most websites are failing to connect for security reasons.

Some sites, including google.com and nytimes.com, fail with an "SEC_ERROR_UNKNOWN_ISSUER" error, and their certificates confirm that they are respectively issued by Google Trust Services LLC and DigiCert Inc.

The website archlinux.org errors with "MOZILLA_PKIX_ERROR_MITM_DETECTED", stating that "Software is Preventing Firefox From Safely Connecting to This Site", citing in particular ISRG Root X1 as the problem. The certificate confirms that it is issued by Let's Encrypt.

The website duckduckgo.com simply errors with "SEC_ERROR_PATH_LEN_CONSTRAINT_INVALID" and states "Secure Connection Failed"

I have confirmed in preferences that my proxy settings are set to "No proxy" and the problem persists across troubleshooting mode and making a new profile. I have also tried removing the cert9.db file in a given profile folder.

I am running Firefox 126.0-1 on an Arch Linux system. Most websites are failing to connect for security reasons. Some sites, including google.com and nytimes.com, fail with an "SEC_ERROR_UNKNOWN_ISSUER" error, and their certificates confirm that they are respectively issued by Google Trust Services LLC and DigiCert Inc. The website archlinux.org errors with "MOZILLA_PKIX_ERROR_MITM_DETECTED", stating that "Software is Preventing Firefox From Safely Connecting to This Site", citing in particular ISRG Root X1 as the problem. The certificate confirms that it is issued by Let's Encrypt. The website duckduckgo.com simply errors with "SEC_ERROR_PATH_LEN_CONSTRAINT_INVALID" and states "Secure Connection Failed" I have confirmed in preferences that my proxy settings are set to "No proxy" and the problem persists across troubleshooting mode and making a new profile. I have also tried removing the cert9.db file in a given profile folder.
Capturas de pantalla anexas

Chosen solution

Solution: the file /usr/share/ca-certificates/trust-source/mozilla.trust.p11-kit had been orphaned from the archlinux package ca-certificates-mozilla, so reinstalling the package and overwriting that file fixed the problem.

Ler a resposta no contexto 👍 2

All Replies (2)

david.carlip
david.carlip Question owner
more options

Update: Clearing my cache makes all of the errors the ISRG Root X1 Error.

david.carlip
david.carlip Question owner
more options

Chosen Solution

Solution: the file /usr/share/ca-certificates/trust-source/mozilla.trust.p11-kit had been orphaned from the archlinux package ca-certificates-mozilla, so reinstalling the package and overwriting that file fixed the problem.