Try this.

Hi - Thanks for the response.

Q: "renaming the cert9.db file in your profile folder" -- renaming it to what?

Hi - Thanks for the response. Q: "renaming the cert9.db file in your profile folder" -- renaming it to what?

Anything, really. I always rename by putting an x at the end, e.g. cert9.dbx.

Thanks - Did all of the cert stuff; didn't resolve the problem. So I remain with a slightly out-dated edition.

Not done yet! Try these in this order, testing after each:

- Clear cache:

  - press Ctrl-Shift-Delete (Mac: Cmd-Shift-Delete)

  - set 'Time range...' to 'Everything'

  - untick all items except 'Cache'

  - clear, then restart FF

- Disable VPN if you're using one

- Change proxy settings: FF menu > Settings > search for proxy > click Settings button > try the other settings

- If using proxy and UBlock Origin, in UBO settings disable 'Uncloak canonical names'

- Change DNS settings: FF menu > Settings > search for dns > try the other settings including another provider

Hey, thank you for your response. Attached are how I interpreted them.

Bad news: Still the same error shows up.

Thanks Nels

Hi

Does this support article help?:

https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect

Hi Hikerman, are you still getting this error code:

PR_CONNECT_RESET_ERROR

That indicates that Firefox received a RST response while trying to connect, which is an instruction to immediately stop trying to connect. The source of this code might be some kind of security filtering or parental control software, corporate proxy server, service provider limitation, country level censorship, or even locally installed malware.

Assuming you already set "No proxy" to try to bypass any special routing, you may want to run some malware scans. The following article suggests tools other Firefox users have found helpful. They either are free or have a free trial.

Troubleshoot Firefox issues caused by malware

Paul - Thank you for the link to the article. Reading it, the only thing that caught my (limited understanding) attention was the

"Clear cached certificates in Firefox. If Firefox has saved an outdated or untrusted certificate, removing it may fix the error. Click the menu button Fx89menuButton and select Settings. Go to the Privacy & Security panel, go down to the Certificates section, click View Certificates…, select any untrusted or outdated site certificates, and click Delete or distrust…?

Q. Since I have no clue whether any are untrusted or outdated, what happens ongoing if I just delete all of them, then reboot. Solve the problem perhaps, or create a bigger one?

Again, thanks Nels