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Issuer Certificate is Unknown. Previously had to create a new profile. Deleting Cert8 file no help. Can Access site on different User Account.

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Can not access a secure site that I previously could. I can access this site on the other user account. Tried to delete Cert8 file, but that didn't help.

"Advanced" shows... The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported.

64 bit Windows 7, Microsoft Security Essentials. One Admin Account & 2 Users. Problem User Account had problems a couple of weeks ago. I believe I tried to Delete the Profile and Create a new one, but I can't recall the details other than some information was left that I didn't expect.

Can not access a secure site that I previously could. I can access this site on the other user account. Tried to delete Cert8 file, but that didn't help. "Advanced" shows... The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. 64 bit Windows 7, Microsoft Security Essentials. One Admin Account & 2 Users. Problem User Account had problems a couple of weeks ago. I believe I tried to Delete the Profile and Create a new one, but I can't recall the details other than some information was left that I didn't expect.
Attached screenshots

Chosen solution

You would need an older copy of the cert8.db file if it was working previously.

You can check if you have an "Old Firefox Data" folder on the desktop if you have used the Refresh feature in Firefox.

If you can't inspect the certificate via Advanced (I Understand the Risks) then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

  • chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx).

  • retrieve the certificate via the "Get certificate" button
  • click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer.

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Additional System Details

Installed Plug-ins

  • Adobe PDF Plug-In For Firefox and Netscape 15.10.20056
  • GEPlugin
  • Google Update
  • npmnqmp 989898989877
  • NPWLPG
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Shockwave Flash 21.0 r0
  • Adobe Shockwave for Director Netscape plug-in, version 12.1
  • Adobe Shockwave for Director Netscape plug-in, version 12.1.2.152
  • 5.1.41212.0

Application

  • Firefox 45.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0
  • Support URL: https://support.mozilla.org/1/firefox/45.0/WINNT/en-US/

Extensions

  • Firefox Hello Beta 0.1 (loop@mozilla.org)
  • Move Media Player 1.0.0.%(version)s (moveplayer@movenetworks.com) (Inactive)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: NVIDIA GeForce 6150SE nForce 430
  • adapterDescription2:
  • adapterDeviceID: 0x03d0
  • adapterDeviceID2:
  • adapterDrivers: nvd3dumx,nvd3dum
  • adapterDrivers2:
  • adapterRAM: 128
  • adapterRAM2:
  • adapterSubsysID: 2a6c103c
  • adapterSubsysID2:
  • adapterVendorID: 0x10de
  • adapterVendorID2:
  • direct2DEnabled: False
  • direct2DEnabledMessage: [u'tryNewerDriver', u'182.65']
  • directWriteEnabled: False
  • directWriteVersion: 6.2.9200.17568
  • driverDate: 7-29-2009
  • driverDate2:
  • driverVersion: 8.15.11.8655
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'skia', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'cairo', u'AzureSkiaAccelerated': 0}
  • isGPU2Active: False
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'tryNewerDriver', u'182.65']
  • numTotalWindows: 2
  • supportsHardwareH264: No; Hardware video decoding disabled or blacklisted
  • webglRendererMessage: [u'tryNewerDriver', u'182.65']
  • windowLayerManagerRemote: True
  • windowLayerManagerType: Basic

Modified Preferences

Misc

  • User JS: No
  • Accessibility: No
Amit Kumar Jaiswal 3 solutions 33 answers

Sorry to hear you that you unable to access this site. Here, I have the following solution of "Issuer certificate is unknown". This type of error usually arises when the file cert8.db in your profile folder has become corrupted. In order to fix the problem, we will have to delete the file while Firefox is closed. To do so, we will need to find and open the profile folder. This can be done by clicking the menu button New Fx Menu , clicking help Help-29 and finally selecting “Troubleshooting Information”. Once the troubleshooting information page opens, select the “Show Folder”. When you have successfully opened the profile folder, close firefox and delete the cert8.db file.

Occasionally, certain browsers will give this error when others do not. For example, Microsoft Internet Explorer can automatically download intermediate certificates the first time you visit a site that needs one while Firefox cannot. Once a trusted certificate is installed properly, all browsers will work without getting this error. You can verify whether the certificate will get a certificate not trusted error by using our SSL Checker. The SSL checker uses the latest roots included in Mozilla's Firefox to determine if a certificate is trusted. For specific compatibility of your certificate see, SSL certificate compatibility. Visit: www.sslshopper.com

Sorry to hear you that you unable to access this site. Here, I have the following solution of "Issuer certificate is unknown". This type of error usually arises when the file cert8.db in your profile folder has become corrupted. In order to fix the problem, we will have to delete the file while Firefox is closed. To do so, we will need to find and open the profile folder. This can be done by clicking the menu button New Fx Menu , clicking help Help-29 and finally selecting “Troubleshooting Information”. Once the troubleshooting information page opens, select the “Show Folder”. When you have successfully opened the profile folder, close firefox and delete the cert8.db file. Occasionally, certain browsers will give this error when others do not. For example, Microsoft Internet Explorer can automatically download intermediate certificates the first time you visit a site that needs one while Firefox cannot. Once a trusted certificate is installed properly, all browsers will work without getting this error. You can verify whether the certificate will get a certificate not trusted error by using our SSL Checker. The SSL checker uses the latest roots included in Mozilla's Firefox to determine if a certificate is trusted. For specific compatibility of your certificate see, SSL certificate compatibility. Visit: www.sslshopper.com

Question owner

I had already tried deleting the Cert8 file as previously noted.

Second paragraph sounds like promoting third party website, I would prefer to try to get Firefox fixed for this user account.

Thanks

I had already tried deleting the Cert8 file as previously noted. Second paragraph sounds like promoting third party website, I would prefer to try to get Firefox fixed for this user account. Thanks
cor-el
  • Top 10 Contributor
  • Moderator
17532 solutions 158534 answers

Chosen Solution

You would need an older copy of the cert8.db file if it was working previously.

You can check if you have an "Old Firefox Data" folder on the desktop if you have used the Refresh feature in Firefox.

If you can't inspect the certificate via Advanced (I Understand the Risks) then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

  • chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx).

  • retrieve the certificate via the "Get certificate" button
  • click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer.

You would need an older copy of the cert8.db file if it was working previously. You can check if you have an "Old Firefox Data" folder on the desktop if you have used the Refresh feature in Firefox. If you can't inspect the certificate via Advanced (I Understand the Risks) then try this: Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate: *chrome://pippki/content/exceptionDialog.xul In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx). *retrieve the certificate via the "Get certificate" button *click the "View..." button to inspect the certificate in the Certificate Viewer You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer.

Question owner

cor-el,

Thanks for your reply. I actually could not confirm that your suggestion would work as my computer died, so I no longer have that issue! This also explains my delay to responding to your post. Thanks again for your suggestion.

cor-el, Thanks for your reply. I actually could not confirm that your suggestion would work as my computer died, so I no longer have that issue! This also explains my delay to responding to your post. Thanks again for your suggestion.