We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Can't establish connection to localhost

  • 3 பதிலளிப்புகள்
  • 28 இந்த பிரச்னைகள் உள்ளது
  • 1 view
  • Last reply by Rewt0r

Hi There,

As of today I seem to be having a strange issue with Firefox 31, I'm unsure as to when this problem began as I haven't developed on this project for around 2 weeks. I have a PHP Development server running on localhost port 8000 using the following command: "bin\php -S localhost:8000 -c php.ini" (without quotes)

Upon trying to connect to this server via Firefox I'm presented with "Firefox can't establish a connection to the server at 127.0.0.1:8000." the message adjusts to show "localhost:8000" when connecting via that method, I've tried running Firefox in Safe Mode, reinstalling Firefox and also changing the network settings to "No Proxy" from "Using system proxy settings".

I'm able to connect through Chrome, IE and also by running a cURL command.

Hi There, As of today I seem to be having a strange issue with Firefox 31, I'm unsure as to when this problem began as I haven't developed on this project for around 2 weeks. I have a PHP Development server running on localhost port 8000 using the following command: "bin\php -S localhost:8000 -c php.ini" (without quotes) Upon trying to connect to this server via Firefox I'm presented with "Firefox can't establish a connection to the server at 127.0.0.1:8000." the message adjusts to show "localhost:8000" when connecting via that method, I've tried running Firefox in Safe Mode, reinstalling Firefox and also changing the network settings to "No Proxy" from "Using system proxy settings". I'm able to connect through Chrome, IE and also by running a cURL command.

Rewt0r மூலமாக திருத்தப்பட்டது

தீர்வு தேர்ந்தெடுக்கப்பட்டது

Hi guis2,

Referring back to the page you linked to, it seems that the IPv6 section applied to my issue somewhat. For some reason network.dns.disableIPv6 was already set to true however once I set this to false localhost:8000 began to work.

Read this answer in context 👍 4

All Replies (3)

This may help check out: [about:networking] In the developer toolbar you can see if there is a cookie with local host stored as well with : cookie list And please also try these steps: Firefox can't load websites but other browsers can

Hi guigs2,

about:networking gives no more information than I already know, after navigating to "localhost:8000" there's an entry in the DNS tab:

Hostname Family Addresses Expires (Seconds) localhost ipv4 127.0.0.1 46

Http Tab Hostname Port SPDY SSL Active Idle localhost 8000 false false 0 0

I've already cleared my cache and cookies and as a result "cookie list" produces "No cookies found for host localhost:8000"

I've already taken the steps in the link you provided (refer to original post), changing proxy settings has no effect, reinstalling has no effect, running firefox in safemode has no effect, firefox is allowed in the Windows firewall (not that this would make a difference since it's localhost)

தீர்வு தேர்ந்தெடுக்கப்பட்டது

Hi guis2,

Referring back to the page you linked to, it seems that the IPv6 section applied to my issue somewhat. For some reason network.dns.disableIPv6 was already set to true however once I set this to false localhost:8000 began to work.