This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Software is Preventing Firefox From Safely Connecting to This Site

hi all,

every website i go on i get this error -

www.vodafone.co.uk is most likely a safe site, but a secure connection could not be established. This issue is caused by Sophos Endpoint RSA Root, which is either software on your computer or your network.

ive made sure "enable DNS over HTTPS" is disabled ie unchecked

but im still getting the error on every website i try to go on

any help please,

thanks,

rob

This thread was automatically locked due to age.

Top Replies

Qoosh over 1 year ago in reply to Sophos User1175 +2 verified

Do you have any additional details on what error is displayed? Could it be "SEC_ERROR_UNKNOWN_ISSUER"? The endpoint is also able to perform TLS/SSL decryption of HTTPS websites. I suggest checking if…

Parents

0 Peter-Paul Gras over 1 year ago

Are you using SSL /TLS inspection rules? Did you install the cerificate in Firefox?

SFVH (SFOS 20.0.0 GA-Build222) - Last (re)boot on November 6th 2023

Asus H410i-plus - Pentium 6605 Gold - 250GB M.2 PCIe NVMe SSD - 8GB - 3 ports

[If any of my posts are helpful to you please use the 'Verify Answer' link]
Cancel
Vote Up 0 Vote Down

Cancel

Reply

0 Peter-Paul Gras over 1 year ago

Are you using SSL /TLS inspection rules? Did you install the cerificate in Firefox?

SFVH (SFOS 20.0.0 GA-Build222) - Last (re)boot on November 6th 2023

Asus H410i-plus - Pentium 6605 Gold - 250GB M.2 PCIe NVMe SSD - 8GB - 3 ports

[If any of my posts are helpful to you please use the 'Verify Answer' link]
Cancel
Vote Up 0 Vote Down

Cancel

Children

0 Sophos User1175 over 1 year ago in reply to Peter-Paul Gras

where do i find the self signed cert for the sophos firewall, if i can get it, i will install on my firefox as a trusted root CA
Cancel
Vote Up 0 Vote Down

Cancel
0 Sophos User1175 over 1 year ago in reply to Sophos User1175

i have no idea if its an endpoint issue or sophos firewall issue
Cancel
Vote Up 0 Vote Down

Cancel
0 Peter-Paul Gras over 1 year ago in reply to Sophos User1175

Please read this: support.sophos.com/.../KB-000035645

SFVH (SFOS 20.0.0 GA-Build222) - Last (re)boot on November 6th 2023

Asus H410i-plus - Pentium 6605 Gold - 250GB M.2 PCIe NVMe SSD - 8GB - 3 ports

[If any of my posts are helpful to you please use the 'Verify Answer' link]
Cancel
Vote Up 0 Vote Down

Cancel
0 Sophos User1175 over 1 year ago in reply to Peter-Paul Gras

that did not work, maybe its endpoint then doing this instead of the firewall?
Cancel
Vote Up 0 Vote Down

Cancel
0 Peter-Paul Gras over 1 year ago in reply to Sophos User1175

Does the traffic hit the correct FW rule? Can you see expected entries in the SSL/TLS log?

SFVH (SFOS 20.0.0 GA-Build222) - Last (re)boot on November 6th 2023

Asus H410i-plus - Pentium 6605 Gold - 250GB M.2 PCIe NVMe SSD - 8GB - 3 ports

[If any of my posts are helpful to you please use the 'Verify Answer' link]
Cancel
Vote Up 0 Vote Down

Cancel
0 Sophos User1175 over 1 year ago in reply to Peter-Paul Gras

its def endpoint, as when i disable web control, it works, i get no cert error

going to google it now but if anyone can help much appreciated

thanks,

rob
Cancel
Vote Up 0 Vote Down

Cancel
0 Qoosh over 1 year ago in reply to Sophos User1175

Let me know if the following article applies to the issues you're experiencing.
- Firefox may experience issues if DNS over HTTPS is enabled

Kushal Lakhan

Team Lead, Global Community Support
Connect with Sophos Support, get alerted, and be informed.
If a post solves your question, please use the "Verify Answer" button.

The New Home of Sophos Support Videos! - Visit Sophos Techvids
Cancel
Vote Up +1 Vote Down

Cancel