Firefox Community Forum

Have used Firefox for years. Today, went to standard sites (eg weather info, local blog site) and get told they aren't secure and can't be loaded. Have tried re-installing Firefox, clearing cookies but no change. No problem with same sites from Chrome. Message is:

Looks like there’s a problem with this site

www.portlandbirdobs.com sent back an empty page. What can you do about it?

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the web.

Error Code: NS_ERROR_NET_EMPTY_RESPONS

I just installed Firefox on my PC haven't had it on this computer since reinstalling windows - I imported my bookmarks and passwords from Edge, thinking it would be a seamless transition, since I used Firefox in the past without much trouble.

Two weeks on, about 95% of every page I open gives an error similar to the one below, and I have to shift+refresh several times to get it to reload before it goes away, (some sites still don't open).

I wonder how common this issue is, and how people fixed it?

Be careful. Something doesn't look right.

Firefox spotted a potentially serious security issue with connect.mozilla.org. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails.

Go back (Recommended)

Hide advanced

Advanced What makes the site look dangerous? The site is set up to allow only secure connections, but there's a problem with the site's certificate. It's possible that a bad actor is trying to impersonate the site. Sites use certificates issued by a certificate authority to prove they're really who they say they are. Firefox doesn't trust this site because its certificate isn't valid for connect.mozilla.org. The certificate is only valid for: *. eero.com. What can you do about it? Probably nothing, since it's likely there's a problem with the site itself. Sites use certificates issued by a certificate authority to prove they're really who they say they are. But if you're on a corporate network, your support team may have more info. If you're using antivirus software, try searching for potential conflicts or known issues. View the site's certificate Learn more about secure connection failures Error Code: SSL_ERROR_BAD_CERT_DOMAIN Jun 5, 2026 10:58:34 AM GMT+10

Proceed to connect.mozilla.org (Risky)

Hello, I run a movie and drama-related website: https://tvmon.com.co/. Recently, I’ve noticed that Firefox occasionally throws the following error when trying to access the site:

"Secure Connection Failed An error occurred during a connection to tvmon.com.co. . The OCSP response contains an invalid signing certificate. Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT"

This issue is very strange because:

1. The site loads fine in Chrome, Edge, and Safari.

1. My SSL/TLS certificate is valid, up-to-date, and passes external tests (SSL Labs, etc.).

1. The error only appears occasionally in Firefox, refreshing sometimes fixes it, sometimes not.

1. Hosting and server logs show no issues at all.

I suspect this is related to Firefox’s stricter OCSP validation, but I’m not sure how to debug or resolve it. Since my site streams drama and movie content, this error is frustrating for users who rely on Firefox.

Has anyone else experienced this intermittent OCSP signing certificate error? Is there a known fix or workaround for Firefox-specific validation issues?

To be honest. Firefox is starting to be a big pain to use. I'm starting to see more and more of this screen where it say's "Be careful. Something doesn't look right" Even when i go to the advance and say proceed. Nothing happens and i'm getting no where. I know many of the sites don't have anything to do with asking for credit card, Scam or even having popup's. I test the sites in other browsers and there work without any issues. But Firefox is starting to lock me out of many sites due to this. How can i make this stop. As i used Firefox for many years.

The sample that is in the screenshot is a Anime data base that i have also used for years. But today shows this. But was working fine yesteday. What is going on and how can i fix it. So i can start using the browser that i love on the sites i want to.

Zachowaj ostrożność. Coś tu nie gra.

Firefox wykrył potencjalnie poważny problem bezpieczeństwa na witrynie ohttp-gateway-merino.services.mozilla.com. Ktoś podszywający się pod nią może próbować ukraść dane karty płatniczej, hasła, adresy e-mail lub coś innego.

Witryna „ohttp-gateway-merino.services.mozilla.com” określa poprzez HSTS (HTTP Strict Transport Security), że Firefox ma się z nią łączyć jedynie w sposób zabezpieczony. Dodanie wyjątku w celu odwiedzenia tej witryny jest niemożliwe.

Hello,

The website I log in for internet banking (https://www.sparkasse-rhein-maas.de/de/home.html) is shown as written in brackets when opened in Edge, but as www.sparkasse-rhein-maas.de/de/home.html when I open it in firefor. And Firefox tells me it's not safe when I want to log in. BUT - as I've only just discovered when I copied and pasted it in here - when copied it shows as https://www.sparkasse-rhein-maas.de/de/home.html, so safe after all? How can that be? I hope there's a good explanation.

Thanks in advance Bettina

Moderator note: This question has been edited to correct the formatting.

When I bring up the certificate-expired URL

<https://oaklandwiki.org/>

in Firefox 149.0 on Windows 11 I am told "You have added a security exception for this site." But not how to remove it. How do I do that? I did not see anything in Settings or about:config; did I miss it?

Hi Love Firefox and use it every day to manage clients Google Ads accounts. Updated to latest version and now I'm getting this warning when I'm trying to access ads.google.com Doesn't appear that I can add an exception, is there a work around that I can use. Look forward to hearing back. Thanks in advance

Paul

i can't do a search. I keep getting "problem loading page" and "secured connection failed" This is happening on both my windows 7 computer and my windows 10 computer. The same thing is happening if I try a google search as well.

Secure Connection Failed

An error occurred during a connection to citizen.jhpolice.gov.in. PR_CONNECT_RESET_ERROR

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more…

Untill last night i could conect with that site https://imtw.ru and its sub forums without eny problem . Today when i press the link i recieve a message that the connection is rejected "Failure to secure connection". As you van see it has the https:// infront and i repeat i was able to connect last night. What may be wrong?

SSL_ERROR_HANDSHAKE_FAILURE_ALERT

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

I have never ever had a problem getting into my bank account until this evening.

Says it is insecure.

How can this happen? I really need to get into my account!

Secure Connection Failed

The connection to www.tab.com.au was interrupted while the page was loading.

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

An error occurred during a connection to ezproxy.yu.edu.jo. PR_CONNECT_RESET_ERROR

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more…

I have an website which I prior to this error message have visited many times on Firefox and had no problems. Recently though around two days ago I noticed that I couldn't get in and was met with the following message "Warning: Potential Security Risk Ahead". I can't bypass it apparently and I really need to be able to access this site as it's a University site.

I can access the site on other browsers such as Chrome and Edge but I use Firefox as my default browser and I'd like to keep it that way. I'd appreciate any help I can get.

Said link: https://canvas.gu.se/

Site: https://www.thegamer.com Firefox refuses to load the site, it does not even show the certificate when clicking on the lock. Using the certificate manager, add exception does not work too, it just refuses to store the certificate. But at least THERE I can VIEW the certificate, which proves it is valid and FIREFOX is at fault:

https://www.ssllabs.com/ssltest/analyze.html?d=www.thegamer.com&latest shows "IO exception" when trying to check the CRL, but gives an A+. Yet Firefox does not even give me the "Continue anyway" possibility. This it tiering, I hate using google chrome based browsers, but of course, it works there. Server 2025, only MS-defender at its default settings.

Subject Name Common Name thegamer.com Issuer Name Country US Organization Let's Encrypt Common Name E8 Validity Not Before Mon, 13 Oct 2025 23:03:42 GMT Not After Sun, 11 Jan 2026 23:03:41 GMT Subject Alt Names DNS Name

• .thegamer.com

DNS Name thegamer.com Public Key Info Algorithm Elliptic Curve Key Size 256 Public Value 04:0E:95:16:C4:A2:23:9D:81:AD:D7:70:4C:4B:A5:F7:68:0E:33:E2:A0:1C:81:6D:0F:1C:F5:C8:EF:5B:C8:64:AD:15:86:5D:5E:E6:FA:A6:DB:41:86:A5:F0:28:7A:45:F4:8D:75:B3:18:43:E9:0F:7C:75:10:AE:F8:A0:04:7B:D5 Miscellaneous Serial Number 06:6C:A7:00:7C:ED:C0:50:E2:FD:4F:6C:A0:8C:0F:86:2B:AD Signature Algorithm ECDSA with SHA-384 Version 3 Download PEM (cert)PEM (chain) Fingerprints SHA-256 D0:D5:E8:73:9E:6D:B1:2D:EC:5D:47:0D:70:BF:58:1C:AC:A5:D3:89:20:6D:54:15:09:E8:42:9C:82:F7:4F:8F SHA-1 53:E6:54:B5:37:0F:4B:23:BE:73:8A:6B:37:6B:BE:A6:A5:86:E4:5B [This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.] Basic Constraints Certificate Authority No [This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.] Key Usages Purposes Digital Signature Extended Key Usages Purposes Server Authentication, Client Authentication Subject Key ID Key ID 53:6A:02:33:30:1C:AD:4D:3B:F2:9F:4D:6D:E4:33:26:31:69:8F:61 Authority Key ID Key ID 8F:0D:13:A2:F6:2E:7E:D1:50:6C:33:18:38:5D:59:8E:23:72:91:CA CRL Endpoints Distribution Point http://e8.c.lencr.org/46.crl Authority Info (AIA) Location http://e8.i.lencr.org/ Method CA Issuers Certificate Policies Policy Certificate Type ( 2.23.140.1.2.1 ) Value Domain Validation Embedded SCTs Log ID 0E:57:94:BC:F3:AE:A9:3E:33:1B:2C:99:07:B3:F7:90:DF:9B:C2:3D:71:32:25:DD:21:A9:25:AC:61:C5:4E:21 Signature Algorithm SHA-256 ECDSA Version 1 Timestamp Tue, 14 Oct 2025 00:02:12 GMT Log ID 19:86:D4:C7:28:AA:6F:FE:BA:03:6F:78:2A:4D:01:91:AA:CE:2D:72:31:0F:AE:CE:5D:70:41:2D:25:4C:C7:D4 Signature Algorithm SHA-256 ECDSA Version 1 Timestamp Tue, 14 Oct 2025 00:02:12 GMT

Subject Name Country US Organization Let's Encrypt Common Name E8 Issuer Name Country US Organization Internet Security Research Group Common Name ISRG Root X1 Validity Not Before Wed, 13 Mar 2024 00:00:00 GMT Not After Fri, 12 Mar 2027 23:59:59 GMT Public Key Info Algorithm Elliptic Curve Key Size 384 Public Value 04:D1:65:F2:5E:DC:4B:B4:0C:02:9C:D2:B2:FA:EE:E9:6C:AB:3A:AE:38:A1:F4:D4:39:32:33:C5:42:D4:CC:33:0C:34:C7:21:20:90:70:5C:E8:62:2F:1C:71:B3:42:D7:79:BE:46:0D:C1:DB:47:A1:13:A0:C7:DF:81:26:63:3B:D4:8D:1D:F6:3D:82:33:32:F6:F4:2B:E7:F5:96:3A:B4:13:67:18:7B:6B:3E:8D:48:D9:EA:DE:ED:AE:6D:3E:87:4C Miscellaneous Serial Number 63:95:93:63:C2:4E:70:82:71:59:18:BF:C3:D7:ED:56 Signature Algorithm SHA-256 with RSA Encryption Version 3 Download PEM (cert)PEM (chain) Fingerprints SHA-256 83:62:4F:D3:38:C8:D9:B0:23:C1:8A:67:CB:7A:9C:05:19:DA:43:D1:17:75:B4:C6:CB:DA:D4:5C:3D:99:7C:52 SHA-1 54:31:7E:B0:76:5F:0B:C6:74:85:51:84:EB:83:74:B4:19:9E:46:55 [This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.] Basic Constraints Certificate Authority Yes [This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.] Key Usages Purposes Digital Signature, Certificate Signing, CRL Signing Extended Key Usages Purposes Client Authentication, Server Authentication Subject Key ID Key ID 8F:0D:13:A2:F6:2E:7E:D1:50:6C:33:18:38:5D:59:8E:23:72:91:CA Authority Key ID Key ID 79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E CRL Endpoints Distribution Point http://x1.c.lencr.org/ Authority Info (AIA) Location http://x1.i.lencr.org/ Method CA Issuers Certificate Policies Policy Certificate Type ( 2.23.140.1.2.1 ) Value Domain Validation

Subject Name Country US Organization Internet Security Research Group Common Name ISRG Root X1 Issuer Name Country US Organization Internet Security Research Group Common Name ISRG Root X1 Validity Not Before Thu, 04 Jun 2015 11:04:38 GMT Not After Mon, 04 Jun 2035 11:04:38 GMT Public Key Info Algorithm RSA Key Size 4096 Exponent 65537 Modulus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iscellaneous Serial Number 00:82:10:CF:B0:D2:40:E3:59:44:63:E0:BB:63:82:8B:00 Signature Algorithm SHA-256 with RSA Encryption Version 3 Download PEM (cert)PEM (chain) Fingerprints SHA-256 96:BC:EC:06:26:49:76:F3:74:60:77:9A:CF:28:C5:A7:CF:E8:A3:C0:AA:E1:1A:8F:FC:EE:05:C0:BD:DF:08:C6 SHA-1 CA:BD:2A:79:A1:07:6A:31:F2:1D:25:36:35:CB:03:9D:43:29:A5:E8 [This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.] Basic Constraints Certificate Authority Yes [This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.] Key Usages Purposes Certificate Signing, CRL Signing Subject Key ID Key ID 79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E