Mozilla Firefox Does Not Connect To Internet When Network Connection Is Up

This issue may happen, if you stop managing your network connections through NetworkManager. However, your Mozilla FireFox setting may be dependent upon NetworkManager service. Just to give more insight, first I will describe why this issue was happening on my system. I am using Fedora 12 distribution, and have been using NetworkManager for connection management. However, recently, to setup bridge networking for configuring virtual machines (VM) with KVM and QEMU, I had to setup a bridge interface manually (by editing /etc/sysconfig/network-scripts/ifcfg-br0), as NetworkManager does not support it yet. Due to this, I was starting/stopping network manually too as follows:

service network restart

Or if you are not root user, you must have “sudo” permission, and run:

sudo service network restart

However, with this, although network connections were up, Mozilla Firefox was working in offline mode, and was not able to connect to the Internet.

There are 2 methods by which you can solve this issue:

1. Stop NetworkManager service as follows:

service NetworkManager stop

Or if you are not root user, you must have “sudo” permission, and run:

sudo service NetworkManager stop

Note: you do not need to uninstall NetworkManager for this.

2. In address bar of Mozilla Firefox, type “about:config” (without quotes). It will show several variables associated with it. Then, in the “Filter” bar, type “networkmanager“, it should show “toolkit.networkmanager.disable“. Currently it’s value should be set to “false“. Just double-click on the value and it will switch to “true“, something you need. Specifically, after setting this variable to true, Mozilla FireFox does not depend upon NetworkManager for its connectivity.
The above solution may not work in every scenario, as the above issue is just one of the many issues causing Mozilla FireFox to not connect with Internet. To address other issues, you may go through:

http://support.mozilla.com/en-US/kb/Basic%20Troubleshooting

Or for list of articles, you can have a look at:

http://support.mozilla.com/en-US/kb/Article+list

Or you can also ask a question:

http://support.mozilla.com/en-US/kb/Ask+a+question

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2 Responses to Mozilla Firefox Does Not Connect To Internet When Network Connection Is Up

  1. sarita verma says:

    Hi I wanna to know that what’s the genuine answer for doing the study overseas in spite of your home country

  2. Charulatha says:

    I am in USA in F 1 visa and was wondering if i can go with my husband for the visa interview as i will be visiting India shortly.

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