Firefox supportforum

On saturday our global sertificate expired and we renewed it a bit late. Now Firefox users cant visit our site, seeing this error message.

   Secure Connection Failed. 
   Please contact the server administrator or email correspondent and give them the following information: Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number.
   
   Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL 
   
   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.

Unfortunately the only way to fix it we found is deleting the whole profile, deleting the sertificates themselves does not work for us. It is very difficult for our users to do it. Can you please help us with this problem?

Firefox won't open my professor website: https://danielesirangelo.altervista.org/ and there's this error How can i fix this?

Version: 91.0.1 Settings--> Privacy and Security -->View Certificates-->Your certificates--> pick target cert to delete-->click ok on confirmation window --> click ok on Certificate manager window.

Restart FF, Settings--> Privacy and Security -->View Certificates-->Your certificates, the deleted cert is on the list again.

The same happens on that under Authorities.

Hi, I've been having issues with Firefox for some time now. Every page I got to throws a NS_ERROR_NET_INADEQUATE_SECURITY error. I cannot fix it by setting network.http.spdy.enabled.http2 to false is because Firefox then starts crashing. In the past I've gone around the error by turning http2 off, but recently, first the developer edition, then after today's update to 91.0-0.1 of stable version Firefox crashes if I turn the feature off.

The developer Edition started throwing NS_ERROR_NET_INADEQUATE_SECURITY sometime in spring, then started crashing in June I think. The stable version followed soon as described above.

I am submitting this ticket from a beta version, which for some reason does not have this issue.

I thought it may be the Linux version of Eset, but removing it did not help. I cannot think of any other reason why am I getting those errors, but it seems I am alone because my colleagues don't seem to have this issue neither on macOS, nor Windows.

After a successful 2-way TLS handshake, I was able to browse my website for 1-2 times, subsequent requests failed with the "Secure Connection Failed" message and there is no error code to understand what the error is. In Network tab, it showed that Firefox didn't send the request to the web server (request_not_make_to_webserver.png). In Console tab, there was a message of "This error page has no error code in its security info" (console_show_no_error_code_msg.png). There is no issue to connect to my website using Chrome.

Did anyone face this issue before? What could be the cause for such problem?

Thanks, Tuan

I keep getting SECURE CONNECTION FAILED trying to sign in to my Gmail Email account. It was fine yesterday. Everything else (websites etc) I can accesson Firefox Browser.

HOW CAN I SORT THIS?

Edited to add TLDR: some Firefox requests to Google servers seem to fail internally. What can I try to diagnose the problem?

I'm having a recurring problem with Firefox on various Google sites: google.com, Gmail, Calendar, Keep etc. For long periods of time (but not always), Firefox completely fails to load the site, or loses its connection after the page is loaded (for example Gmail displays an error message "Oops... The system encountered a problem (#001)"). The problem usually seems to occur for periods of many minutes, with occasional gaps where the sites work properly. Also, it seems to be site-specific: sometimes it will load google.com normally while Gmail is still having problems. This is really frustrating, I'd like to use Firefox for all my browsing but I also need to use Google services regularly and that doesn't work if Firefox won't load them properly most of the time.

I'm pretty confident it's a problem with Firefox itself, and not with my network or computer, because I get the same issue across multiple Firefox installations and versions (Firefox 90 and 91 on Windows 10, and Firefox 78.10.0esr and 90 on Linux), and while the problem is happening I can access the same sites successfully from a different browser on the same computer (Chrome or Edge). I've tried refreshing my Firefox profile, working in a private browsing window and using a completely new profile, but the problem still occurs. I've also made sure I'm using "Standard" protection in Firefox's security settings and disabled Enhanced Tracking Protection for the sites I'm trying to access.

I've tried to look at what's going on using Firefox's Network Monitor, and the key thing that seems to happen when this problem occurs is that one or more network requests to a google address (google.com, mail.google.com or ssl.gstatic.com) appear with "0 B" in both the Transferred and Size columns (see screenshot attached). Sometimes the failed network request has a simple padlock icon as in the screenshot, and sometimes a red error symbol with mouseover text that says a security error prevented the resource being loaded. There's also occasionally an error message in the Console: "A ServiceWorker passed a promise to FetchEvent.respondWith() that rejected with 'TypeError: NetworkError when attempting to fetch resource.'.". Removing the relevant service workers in about:serviceworkers doesn't make any difference. On Linux, I've tried using tcpdump to check the actual network traffic and it looks like nothing is actually sent across the network for these requests, so whatever the problem is seems to be happening inside Firefox itself.

Ticking the "Disable Cache" box in the network monitor doesn't help. If I manually resend the same request using the menu in the network monitor, a normal response is received (but the content is not actually displayed in the browser).

It looks to me like some kind of caching or security problem, where Firefox somehow gets in a state where some network requests are blocked or fail to load from a cache, but after a while whatever is causing the problem is cleared and it works normally for a minute or two before the problem recurs. I would simply report this as a bug on Bugzilla, but I can't offer steps for anyone else to reproduce the problem because it only happens when I'm logged into my own Google account. I've run out of ideas for how to diagnose or fix this. Can someone suggest anything else I should try? Thanks!

Hi all,

while playing (or better "fighting"...) with a linux docker container on Win10/WSL2/Ubuntu for using the MS spfx tool chain, I generated a SEC_ERROR_REUSED_ISSUER_AND_SERIAL in FF85.0/Win10 by first setting up a certificate exception for a dev-cert (https://localhost:4321) and then have the certificate re-created.

As described the support article [https://support.mozilla.org/en-US/kb/Certificate-contains-the-same-serial...], I removed all certificate exceptions for localhost:* and deleted the "gulp" authority in options/security/certificates.

Unfortunately, the SEC_ERROR_REUSED_ISSUER_AND_SERIAL persists even after a restart of firefox.

Any help is very much appreciated...

Thanks & greetings Markus Fehn

I got a new printer today. Epson WorkForce Pro 3820. When I access the web interface, I get this error. I can proceed past it but I'd like to know how to get rid of the error. Thank you. Barbara

Warning: Potential Security Risk Ahead

Firefox detected a potential security threat and did not continue to 192.168.xxx.xx. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details.

Learn more…

192.168.xxx.xx uses an invalid security certificate.

The certificate is not trusted because it is self-signed.

Error code: MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT

View Certificate

Dear Mozilla Community,

I have problems with one website. This website is poczta.wp.pl. Sometimes this can't be loaded. I see this error:

"SSL_ERROR_INTERNAL_ERROR_ALERT".

This is website with https protocol. What is the reason? Other websites works fine. I think that this is not problem with my router or internet provider because I changed both and it is still problem there. I had this problem also on another computer with Windows 10 operating system. I contacted with administrator of this website and they think that all is okay so they suggested me that this can be problem with browser or my computer.

This behavior is very hard to test because this issue is showed very rare. Sometime one time in one week and sometimes two time in one day. I don't know what is going on with this.

Can you help?

Hello,

bellow ca and cert leads to the SEC_ERROR_BAD_DER error in Firefox. In Chrome it works ok. What is wrong?

ca:

MIIGWDCCBECgAwIBAgIUENZtuCf3Tob4s6huBzfC8ZAJkLEwDQYJKoZIhvcNAQEL BQAwUjELMAkGA1UEBhMCUEwxDzANBgNVBAcMBldhcnNhdzEYMBYGA1UECgwPKi5s b2NhbCBkb21haW5zMRgwFgYDVQQDDA8qLmxvY2FsIGRvbWFpbnMwIBcNMjAwOTE1 MTEwODI5WhgPMjEyMDA4MjIxMTA4MjlaMFIxCzAJBgNVBAYTAlBMMQ8wDQYDVQQH DAZXYXJzYXcxGDAWBgNVBAoMDyoubG9jYWwgZG9tYWluczEYMBYGA1UEAwwPKi5s b2NhbCBkb21haW5zMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAyM+E 2qiGxytcwOgedhO5O7jQ1j1eYWic1nPbTJPvusCN48mEmwr8SrrfLtRnbKpql/R1 NxQpHLLnY2Yl+6wyfOa/bSickFr1i6MUhIo8E2QgzcxKz8ZhnURen/UHBDhVozIu zmnlEO8xlTJ7Oo8XYRKyA0AcZFKchOcJ5n0dLukWRma/fydZwkWFPqSON4Gph6l7 iINxzLhBwV9QzJqiJ2SoBK5TrpDuTrQ/S5s0lwtzF5bNAz7Unerdj18A00OcINso 7rov9USeKIxHNt2iNZB5QiUkwGqEOuv0D+COv0tBD/fghRYGCLD3kjz2ZlR3r+Ge 6JF/+veM68bUztLE80cjJQG0yTCG5FrkMg05bIZ45OZjIvAMDL/1UJXiANiJFYIv V9ePuXWfKJs//vU31fG44K27dB/IrFwepYVAbTSrPZnGCx9QlXiUpeW0TTBV6IKB AYzSl3t4FYpGFb52mWNlI639hI9GJ8LYnts4dO2U7jxRyQEnTjsF0NJolTyopVEl f2z3FRo3s7K5M8Qshm9mPkJp6wfo39EAQV3tNQnixvZl3lJGSsuK+y8OaAv1Dwvt iH1FWzxnDDKzqR1ZVjyIQlbUMiAzjIC1crGKUlm7Da7gF5x1BdWgyKB5i2+S3VyA r0x1Syi0VbNrW1JQfJRs98VDI96tZ/N8+r4lzeMCAwEAAaOCASIwggEeMB0GA1Ud DgQWBBQjEzbpKy4CdyO+MQ+9ncqhuBPmEjCBjwYDVR0jBIGHMIGEgBQjEzbpKy4C dyO+MQ+9ncqhuBPmEqFWpFQwUjELMAkGA1UEBhMCUEwxDzANBgNVBAcMBldhcnNh dzEYMBYGA1UECgwPKi5sb2NhbCBkb21haW5zMRgwFgYDVQQDDA8qLmxvY2FsIGRv bWFpbnOCFBDWbbgn906G+LOobgc3wvGQCZCxMAwGA1UdEwQFMAMBAf8wCwYDVR0P BAQDAgEGMFAGA1UdHgRJMEegEzAHggVsb2NhbDAIggYubG9jYWyhMDAKhwgAAAAA AAAAADAihyAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADANBgkqhkiG 9w0BAQsFAAOCAgEAqBaI/6wL7AiaNO0A3/fW6Vs2Pv26GZ5MHCJ7utatgUWMeko6 VeA7ox1mI06Gtio/uZeAkcHWH3Mv8OTel09jPok524GhUCXZPWmy6Fw6UTqjCMZE BJE3DK4alXDyAd/huHu35HeG+yc4JcSjrMeWmXPp70YsfrfAHMFyu/xpsvasYFKR OLPNHvoOXSv2dE94RtrvTYchMb1Hny0T1UEq/9zKhfEyY+gL/49d5lnNc8gFflsN oxwQrJR5+Za2UhCk5eXtjihsHEEx5ATcWYKPWZjpJ1rzfBqy7GKdu6ooB/yItabq Mu9WGSgRDU//TvGgfppU0SdSGjdAfwPaxQMlNXzhdADzCshn+vrn3Dbjm0i1VVL3 ud/0I70SVNqQyBcH6qfieSL6Wzusz8HNKtTo7cTiIfQ9syUwLK+HZSOOaNkBsMvh c5BFUo6KReiea3+WSN912ZrVhXutA5TMhRNCnk2CWHnfJcKn69s1YErN36/OBHyP +Tyddb5wue/z5BF3yDEVJGbN+NLApIFC9GdqoRMmU6TRyIsGjIuWVqHrnZxLLYhs dB7bz3Di356w9E2ICKEy6g9OQHKHuL4MAzy9k3/ATQ6L/6DJsU60xDYNueLSBXaA gQ367qh5CSOq2Gh18Lyo1dNKRqhekhj+PQIIZrx7k9UhJGa4EEmFLNnOZ60=

cert:

MIIEOTCCAiGgAwIBAgIUFh/RK2IbfX8WuyuicSyTbnys14owDQYJKoZIhvcNAQEL BQAwUjELMAkGA1UEBhMCUEwxDzANBgNVBAcMBldhcnNhdzEYMBYGA1UECgwPKi5s b2NhbCBkb21haW5zMRgwFgYDVQQDDA8qLmxvY2FsIGRvbWFpbnMwIBcNMjAwOTE1 MTEyMDEyWhgPMjEyMDA4MjIxMTIwMTJaMB8xCzAJBgNVBAYTAlBMMRAwDgYDVQQD DAcqLmxvY2FsMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuERKh7lH TqrCC395M7gSoNAoXrM2TQ7xmBShuoeypCQaPHnufD40+3CxVWOUznC4k+OchDni TUcRJq6Zck3uRC5cC7H7vP6ULiwk5lTWZwKwmW8BTt/Qu+FnXBG+PLUF24s0Cqv4 wUOubU+/DamdwoufmYGjNxreddcJu8oCMuwJKGv3WTGmCsYHWmebrKE/ayw/MlWi 5oB8XrxpeZlD+po4H0rv1s2f1m4nXbEGjq3Wxdwh2dbwEQEMUjGNc+lRGS3evBo8 SF6+Ot8Wzfa/NYGlUcA3jYVHl9gMG398pGikrmTecXh5w0VOKJ4qSMhgzMqIH5WR DfT6VSG6AwZDqQIDAQABozgwNjALBgNVHQ8EBAMCBeAwEwYDVR0lBAwwCgYIKwYB BQUHAwEwEgYDVR0RBAswCYIHKi5sb2NhbDANBgkqhkiG9w0BAQsFAAOCAgEAtClj BoRiitzzzr0H7hZGI4RWa17L9ou1cmwBC10fdrgOPON9Kwsh632t82/EGfHmRR3D KCVke12Qd7jTchGna03JU+0zuc+5WN5LuBc/1R0iYWVwHmYWQtkLuBaWEvOvsH4N 8Og37Gn0nI8UBCZd8V9MgIIhsAJ0pk8vNi0bv5TnZk5n+IZtpWTQZVZj3F/8tAN3 ZNwkec8RjLCKsXygwadKNxkuxMrecqIKrOsE+mxpHuxciEoQHIrlYmwS7fdUYdtk vzS7UrKopNj1uAMAd31XDeEs1aXsJDnF3mk3sdKyx7/Alv01GA9FCCQJpa+naOtP e6rxcoDk1ffGDUIKr1QJgVrKUco4jrwmYLMOSjEOwzDH1zcmMeOs97OP2qKZE9BI i3nPQno907odphdRz0NA3mGy70mz6pTnsYOPW/9QFL25A8dsD10OPSrGjmKkSyv0 rRnJCx5uYXuz5Yw2fO097n1z7jEGu9Ve27pvifG2pgT4PA1a3lWFDDlABo+cyDVB +OSvIWvr0YZpfQYam069AF2vtyqdw8FWHTlV9zH/6r3gXk9VrLBrzNWMCnUJwK7h Y8mnUwc9nVtWqwNxIS9oda4R7DImhEmNK3xz2lEpHIWVisd8p+TuTVHL2D22WzPX 76MD6hy8iNxOTr00+c+NcDzrqjH4FftkvEEg35g=

After auto update to FF 89.0, access to long-time Fidelity account is intermittently blocked as a security warning, or causes DSL line to drop at submission of account security code, or displays account entry page as plain text, not std HTML formatting, or most often results in a technical error page saying try again later. MS EDGE works fine, no issues. This is the only webpage this occurs on. Fidelity has no FF reported issues on their end nor does my IP supplier. Using desktop PC, running Win10/64-bit, DSL line @ ~ 2.3 Mbps. Using the "Light Theme" which was auto set with 89.0. This plus the new bastardized menus will push me to drop FF since I can't afford endless hours to fix basic functionality with ea update.

I note that there are 399 posts referring to this problem. The problem has existed on my PC for about 4-5 months.. DELL support has checked my computer, we have cleared cache and browser and tweaked other controls but nothing helps. I have no problem using Google Chrome. If so may people are having the same problem surely Firefox should be making an effort to fix the bug??!! Just drafted a reply to you from Firefox site but as frequently happens message appeared -

 Something about oops and an error message. When it occurs drafts do not save and messages do not transmit.

Sorry the screen print will not copy across.

I use Firefox as my main browser and it is inconvenient to have to swap between Firefox and Chrome

Can Firefox please fix this problem?

thank you mlmg

i have ff latest version on windows 10 96.0.1 64b I have seen another entry in support about the same topic, but does not solve my problem when i logon to federal service with eid card they use a certificate when I changed my eid a new certificate was downloaded, and old is also available but when trying to login with new eid, error in edge i tried and there I get a prompt with certificates that exist and which to use : select new and ok I want to delete in ff this old certificate setting- security-certificates deleted the entries for citizen ca - close browser -open - they are still there I renamed also cert9.db cert8.db as in other entry : still there how to remove permanently these certificates to be able to login with eid or how to select which certificate to use thanks for all help best regards, Guy

Friends,

I'm really, really hoping someone here can help me:

I've been trying to load my website: www.photostills.com using the latest Firefox Browser V. 94.0.2. but continue to recveive the following message: (see below)

I have tried resetting my preferences to allow access. I can open my site in other browsers without a problem but really need to have clients access it from Firefox as well.

Please, please advise.

Thank you for your help!! Here is the error message:

Secure Connection Failed

An error occurred during a connection to www.photostills.com. Cannot communicate securely with peer: no common encryption algorithm(s).

Error code: SSL_ERROR_NO_CYPHER_OVERLAP

   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.

Hi!

So i have a problem with opeing sites : Google and Youtube. It happend randomly. All was working great i restarted computer and suddenly its not working;/ I scaned for viruses - download eset - nothing. When eset war running it started working again - i deleted eset since it was slowing down my pc, and the problem is back.

Error code: SEC_ERROR_UNKNOWN_ISSUER

Error info:

https://www.youtube.com/?gl=PL&hl=pl

Wystawca certyfikatu uczestnika komunikacji nie został rozpoznany.

HTTP Strict Transport Security: true

HTTP Public Key Pinning: true

Łańcuch certyfikatu:

MIIDdjCCAl6gAwIBAgIQKd8+XqA5qrZPzhYj71P8MzANBgkqhkiG9w0BAQsFADAj

MSEwHwYDVQQDDBhEaWdpQ2VydCBHbG9iYWwgUm9vdCBHMUEwHhcNMjAwNDA4MDcx

NjI2WhcNMzEwNDA4MDkxNjI2WjAaMRgwFgYDVQQDDA93d3cueW91dHViZS5jb20w

ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDeIu9SWvCMhhDqkCCvRmDY

/8Z/EyxMySr5+CgqMmApxmNA5kKSDpjbCFGuRTkC/2SwLiaQCRuovVvwvZrk8Tlu

dxu6txaDQg9nldZVS19FO5bj5L/8FO7n82bLxm+omGDF+IVbZW+338fbfO/HcxS1

GEnammeE44nw8vYdpPrQx481gu9AGMLsQLUM/EwUQ4u4FHQPKE9z6iUtkebv0/h+

4GbhvdDegrCXyvJSXuzxzilgtB5R1inw5UvibVcStdpjL69+px39OKJvV05eqNfJ

xJtxjmx7HQgZcjdW/Xo1f4yYxyaT9toYxdPpH1atB58TlsMA66x/Z2kKK2gL+MiB

AgMBAAGjga4wgaswEwYDVR0lBAwwCgYIKwYBBQUHAwEwDAYDVR0TAQH/BAIwADAO

BgNVHQ8BAf8EBAMCBaAwNgYDVR0RBC8wLYIPd3d3LnlvdXR1YmUuY29tgg0qLnlv

dXR1YmUuY29tggt5b3V0dWJlLmNvbTAfBgNVHSMEGDAWgBSWti4vM+xzcoW7bzKo

dbvLnKtUdjAdBgNVHQ4EFgQU1lIhGk7z+LGh+Amnt433ZZmGSoAwDQYJKoZIhvcN

AQELBQADggEBAGAlYFFFqa/XToQ6idM+5F9a1l+IOHfp8og3pg1Z1GVbfrB14eRJ

ZulnLkJI0cxpSNgLo9m9sl6+JdL85gV0f/6PpxDgflfZBKJgPxFtDShemgRiY2jQ

Vl6b7/Rp8nR1r3kfdcc1mA0XQKnzt4RxjzFUqHycWbkiBVPBm+ZVD2btgb8gVluZ

ScGRF0GolVx84KoE1A2WkrxRgu/lprAV/8I6AZxnI8oSBc/SqRXjInbtt1jd0xMe

nOCYTjOld+52kl3/LTCmSmHtBau0JlRROAMchNl7xhGrwNer9uYuylFC85xa0GzA

7S6uZRV3pnqWHBq9BUvU+Tm/hLfGkHcZI/E=

Need help :)

Thanks

I am repeatedly getting the SECURE CONNECTION FAILED error only for Google-related sites like Youtube, Gmail and Google search. I've to then close Firefox and immediately open it again to see those sites again.

This is the Error: Secure Connection Failed An error occurred during a connection to www.google.com. SSL peer was not expecting a handshake message it received. Error code: SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT

&

"Secure Connection Failed An error occurred during a connection to www.youtube.com. PR_CONNECT_ABORTED_ERROR"

FYKI, the problem started occurring in November, 2021. It had never happened before. I repeat, this error is occuring only for Google-related sites, not for others.

What could be the problem? Please help!

I have recently upgraded to windows 11. After this upgrade, I am facing connection issue in the firefox. Generally, I keep open my Office Gmail Account till my office hours around 8 hrs daily. After the opening the mail it runs as usual, but after ten to fifteen minutes it shows connection error. It continues showing the same error for the whole day. While I tried this things with the other websites, it shows same error for other websites also. The same thing I have tried in Google Chrome browser, there is no such kind of errors or difficulties are found. Kindly guide me further or please update the same.