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Invalid URL The requested URL "/", is invalid. Reference #9.a2fc54b8.1345130184.5cbbba6

  • 3 ردود
  • 8 have this problem
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  • آخر ردّ كتبه daleshmale

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At least once a day on my work PC Desktop I will type in Yahoo.com or Amazon.com or any other valid popular website and all of a sudden I get the "Security Exception" error message and when I select to confirm it I then get:

"Invalid URL The requested URL "/", is invalid.

Reference #9.a2fc54b8.1345130184.5cbbba6 "

At that point I cannot access that website at all. Then I have to clear all history and restart my computer, at least once a day and hope it works. I've scanned the support forum and I have done everything they suggest: disabled all add-ons (not that I even have any), reset Firefox, restart in safe-mode. Nothing works, it's very frustrating. It completely interrupts my workday. HELP!!

الحل المُختار

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"

See also:

You can try to reset (power off/on) the router.


A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

You can also do a malware check with some malware scanning programs on the Windows computer.

See:

You can also do a check for a rootkit infection with TDSSKiller.

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All Replies (3)

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Hmmm, there are some issues on certain sites caused by the new Autofill feature that suggests a URL in the address bar. When this happens, are you pressing Enter to accept a suggestion?

If so, related threads:

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الحل المُختار

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"

See also:

You can try to reset (power off/on) the router.


A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

You can also do a malware check with some malware scanning programs on the Windows computer.

See:

You can also do a check for a rootkit infection with TDSSKiller.

more options

Thanks for the recommendations. I tried just about all of them (clearing cache, cookies, checking for rootkit infection, turning off virus check software, disabling add-ons/restarting firefox in safe mode) to no avail over the last few days and it seemed it was actually getting worse. Then, finally we reset the router today (holding the reset button for 10 seconds) and looks like this may be the fix. It messed up some wireless connections in the office temporarily but I am crossing my fingers that it did the trick. THANKS!!