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  • Đã giải quyết

DNS-to-HTTPS is causing the REMOTE_ADDR server variable to be incorrect

I am a software developer for a Human Resource Information System (HRIS) called EnterpriseAxis. My HRIS software checks the IP address of each user to determine whether o… (xem thêm)

I am a software developer for a Human Resource Information System (HRIS) called EnterpriseAxis. My HRIS software checks the IP address of each user to determine whether or not the user is on the company's LAN or VPN. However, there is a bug in Firefox that prevents this security feature from working.

The bug is in DNS-to-HTTPS. When this feature is enabled in Firefox, it changes the value of the REMOTE_ADDR server variable. Normally, when a VPN tunnel is active, REMOTE_ADDR contains the workstation's IP address, such as 192.168.11.6. However, when DNS-to-HTTPS is enabled, REMOTE_ADDR contains the router's WAN IP address, such as 96.91.16.207.

Please correct the issue.

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  • Đã giải quyết

Can't get Firefox working with custom Dns-Over-Https server

Greetings, I have a custom DoH server that I'm trying to get working with Firefox's DoH mode. Looking at the traffic, Firefox is sending an initial NS query type to the s… (xem thêm)

Greetings,

I have a custom DoH server that I'm trying to get working with Firefox's DoH mode. Looking at the traffic, Firefox is sending an initial NS query type to the server, and the server is sending back what looks like a valid response in Wireshark, but Firefox seems to give up on sending further DoH queries after this.

Is there a debug mode I can enable in Firefox to glean what about the response it doesn't like? I couldn't find any console in the Web Developer tools to display diagnostics on the DoH handshaking.

Thanks, Ryan

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  • Đã giải quyết

Many sites not loading due to PR_END_OF_FILE_ERROR

For some time now - two or three weeks - I experience R_END_OF_FILE_ERROR on many websites. It is only under Firefox. And not on all sites. One example is coronavirus.bg.… (xem thêm)

For some time now - two or three weeks - I experience R_END_OF_FILE_ERROR on many websites. It is only under Firefox. And not on all sites. One example is coronavirus.bg. I can't open it under Firefox. I use Firefox v.75 on Windows 7. I tried:

  • checking TLS settings - screenshot attached. Seems fine.
  • clearing the cache; didn't help.
  • turning network.dns.disableIPv6 to 'true'; didn't help.
  • turning network.dns.disablePrefetch to 'true'; didn't help.
  • restarting Firefox with add-ons disabled; didn't help.
  • scanning for malware; Malwarebytes didn't find any.

I am also attaching my browser test results from ssllabs.com.

I honestly don't know what to do and what is the issue. Please advise.

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  • Đã giải quyết

Does Firefox + Cloudflare DNS over HTTPS block queries to known malicious sites?

Does Firefox + Cloudflare DNS over HTTPS block queries to known malicious sites like OpenDNS. I use OpenDNS at home to automatically block queries to known malicious sit… (xem thêm)

Does Firefox + Cloudflare DNS over HTTPS block queries to known malicious sites like OpenDNS. I use OpenDNS at home to automatically block queries to known malicious sites. Using Firefox DoH bypasses this. Am I faced with privacy versus security or does Cloudflare service also prevent access to malicious sites? Thank you.

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  • Đã giải quyết

Configured DNS over HTTPS, but DNS is still coming from my ISP

I have configured Firefox (version 74.0 for Mac) for DNS over HTTPS with Cloudflare (see image 1). But if I enter a domain that does not exist, I get a branded page from … (xem thêm)

I have configured Firefox (version 74.0 for Mac) for DNS over HTTPS with Cloudflare (see image 1). But if I enter a domain that does not exist, I get a branded page from my ISP, Verizon, that says the domain does not exist (see image 2). So apparently Verizon is still responding to my DNS requests, not Cloudflare over HTTPS. Any idea what's up? Thanks.

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  • Đã giải quyết

Firefox refuses to allow me to connect to my centurylink.net email page

before the most recent update I have no trouble connecting to my centurylink.net email.....and now after the update I get this message: Secure Connection Failed An error … (xem thêm)

before the most recent update I have no trouble connecting to my centurylink.net email.....and now after the update I get this message:

Secure Connection Failed

An error occurred during a connection to webmail.centurylink.net. 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.

Nothing I do will allow it to connect. yet it seems to work fine in chrome or internet explorer, just not firefox.

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  • Đã giải quyết

Why is DNS-over-HTTPs not being disabled when I have the canary domain set to return status NXDOMAIN?

I'm trying to disable DNS-over-HTTPs on my home network so my Pi Hole acts as my DNS server for Firefox while at home. I've configured it to treat the canary domain use-a… (xem thêm)

I'm trying to disable DNS-over-HTTPs on my home network so my Pi Hole acts as my DNS server for Firefox while at home. I've configured it to treat the canary domain use-application-dns.net as if it doesn't exist. If I try to open that site in a different browser it says the server can't be found, and if I do a DNS lookup for it it confirms that my system gets NXDOMAIN for that domain name:

$ host -t ns use-application-dns.net

Host use-application-dns.net not found: 3(NXDOMAIN)

However Firefox continues to use DNS-over-HTTPs. Is there somewhere to find a log that shows when Firefox looks up that hostname to see if it's actually performing the check?

Environment:

Firefox 73.0 64-bit

macOS 10.15.3

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