"invalid url "/" is not valid" only appears for my laptop

i received the message "invalid url the requested url "/", is invalid. reference number #9.3e556acb.1337262673.220f958c"
this message only appears for facebook webpage. other website is fine. Also only my laptop have this problem,my friend laptop connected to same line have no problem. Have tried different browser and all also cant connect to facebook. Have also tried https and http and result still the same
Have tried many different solutions found on internet such as: 1.)start in safe mode
2.)set internet network to "auto search proxy"
3.)restart pc
i cant restart modem cause i'm using hostel line.

That does sound like spy/malware to me. See here:
[http://antivirus.about.com/od/securitytips/ss/hosts.htm]
Maybe try a full scan with malware byes or spybot s&d just to be on the safe side.

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Safari 5.1.7 "Invalid URL" & "certificate not valid"-Google won't even work! HELP

I have the newest version of Safari and as far as I know everything else on my computer is up-to-date. I checked for a software update and it claims everything is up to date. This has been happening for a little while and started with the invalid site certificates. I never was sure if I should click "continue" or "cancel". I first was clicking cancel and continue trying to see what changed. Cancel would keep me on the same page (I think, if I remember correctly) and continue would usually take me to the desired site. But recently this problem with site certificates has been happening more and more on different sites (I believe it began on facebook; and on sites I use daily). I just tried to google the problem and of course a web page of "Invalid URL" comes up. So I tried to see if it would work on a different browser (Firefox and Chrome), I had the same problem on those two, too, which makes me think a Google problem. However, this happens on other sites, such as facebook, and the site doesn't work for a little while (usually a period of X minutes). Even when I completely quit Safari, this doesnt change.
I reset Safari tonight, and I've cleared the cookies, and I've emptied the cache, but nothing seems to be working. Im starting to wonder if there is a way to downgrade just one version of Safari to see if maybe this is a bug on this version of Safari, but I have no idea if that's possible or if it'll work.
Please help!

I hear ya...irritating as ****. It's on all the other I've followed th other threads and tried the fixes, so far nothing. Hit me up if you ever find a workable solution other than going back to a PC. :s You'd think Apple would've fixed this by now, cause they're supposedly very very very very good.

Running Windows XP service pack 3. Updated Firefox from 8.0 to 9.0. Now when Firefox opens "The URL is not valid and cannot be loaded" is displayed in a window and no home page appears. What's wrong?

Running Windows XP service pack 3. Updated Firefox from 8.0 to 9.0. Now when Firefox opens "The URL is not valid and cannot be loaded" is displayed in a window and no home page appears. What's wrong?

That issue can be caused by an extension that isn't working properly.
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

The URL bar can also be used for a search engine, but when I search something a page pops up reading "The URL is not valid."

When I click on the URL bar it says to insert address or search, yet when I search it says the URL is not valid, which is obvious because I didn't put in a URL, I searched something. I never installed an add on or anything. It just quit working one time and hasn't worked since.

Does it happen to all the search words or particular words?
It may be a malware issue too.
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. 
'''Note''': ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

URL is not valid and cannot be loaded pop-up problem has started again and I can't find any reference in FF Help. Do I have to scroll thru 23,000 support questions asked?

This problem HAS happened before, maybe 1.5 yrs ago. While on a valid page a pop-up saying URL is invalid and can not be loaded appears. Frequency starts increasing in time. Then I can not load any of my bookmarked pages without re-starting my laptop. Has been getting worse since last FF update.

well after 4 days and no support help, I said screw it. Good bye FireFox, your excellent customer service on this issue drove me to install Google Chrome. Just like Opera's piss poor customer support drove me to FireFox, now Firefox is driving me elsewhere.
This issue is NOT AN ADD ON issue, nor THEME ISSUE, its a FIREFOX ISSUE, but their lack of a fix is inadequate for me. I hate the damn annoying pop up every time I open firefox so I will dump firefox and move on after 5 yrs.

The URL is not valid and cannot be loaded

seems like maybe firefox mishandles untrusted certificates?
It gives error: Alert The URL is not valid and cannot be loaded.
example:
https://notes.corp.cat.com/
other browsers can load this URL just fine. When I visit it in Firefox, I get the error in a simple little message box with a yellow triangle exclamation point, titled "Alert".
ALSO.... when I click the "Home" button in firefox, I get the error, and the home page does not load. Currently the home page is set to "Mozilla Firefox Start Page."
changing the home page to: http://www.google.com/ allows the home page button to work normally.
restoring the home page to default brings the error behavior back when clicking the home button.
changing the home page to: https://notes.corp.cat.com/ produces the same error, just like when I manually type in an https URL with a funky security certificate.
This problem only seems to happen on secure URLs with untrusted certificates, i.e. sites that are too cheap to pay to have their certificate registered with one of the certificate vendors or however the hell that works, so as a result every time you visit their web site, your browser starts to whine that it might be a forgery or whatever.
It used to be in Firefox that I could load these pages and just specify that I want to trust the site anyway. Now firefox gives this error that doesn't allow the user to know what is really going on or what the reason for the error is. It is as if the developers decided that users are too stupid to decide if they really want to visit the site or not, so as a result Firefox is just refusing to visit any web sites where the authenticity of the certificate can't be verified? Hey, it's not a bad idea, to be honest. :-) But it's kind of annoying, because here I am, sort of smart enough to know what I'm doing, but I don't have the choice in the matter...
I restarted with all add-ons disabled and that didn't help. I don't have much installled in the way of add-ons anyway. All I have is JAVA quick starter 1.0, and Adobe Acrobat, Java development toolkit, Java platform SE, Microsoft DRM, and Windows Media Player Plug-in Dynamic Link Library. Not even Flash. All the above is disabled now that I rebooted with add-ons disabled, and I still have the issue.
thanks for any help you can provide.

Please [https://bugzilla.mozilla.org/show_bug.cgi?id=713167 see this.] Installing [https://www.microsoft.com/download/en/details.aspx?id=5638 Visual C++ 2005 SP1] or the .Net Framework 3.5 SP1 may help mitigate the issue.

I am getting an Alert, that says, "The URL is not valid and cannot be loaded.

Can't think of anything else to say.

i get the same message, "The URL is not valid and cannot be loaded.".
i've narrowed it down a bit more.
i've got a freshly installed firefox US 9.0.1 on a freshly installed windows xp pro sp3 US (fully patched). a freshly installed separate firefox 3 install is on this machine too, but that does not seem relevant.
the problem only occurs when i load https-urls with invalid certificates (eg self-signed) in the case that i use a firefox with a non-default profile.
so the "default" profile displays a "this page cannot be trusted" screen as expected, i can open the url. but in a different firefox instance/profile, when going to the same https url, i get the error popup. the firefox profile/instance is started like this: firefox.exe -P dev -no-remote.
i have reinstalled firefox 9 & 3 because of this issue. the problem stayed. i didn't remember whether i could load the https url with the default before the reinstall. perhaps i couldn't...

How do I enable Firefox 4 to do a search on more than one word (e.g. "yahoo mail") without receiving the error message "the URL is not valid and cannot be loaded"?

After loading Firefox 4.0, I changed the address bar search engine to Google Search by Name, so I'd be taken straight to the most relevant webpage when I type in a word.
It works fine when I type in one word, but if I use a search with more than one word (e.g. "yahoo mail" or "google maps") I get an alert saying "The URL is not valid and cannot be loaded". Is there any way I can fix the address bar to accept multiple word searches?
I've tried disabling all my add-ons, but it didn't make any difference.

Hi, this should sort out your problem:
1. Type in "about:config" into the address bar, this will open the settings menu. Click on "I'll be careful, I promise!"
2. Search for "keyword.URL" in the filter bar.
3. Enter "http://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=" into the value field.
I'm no expert, but I had the same problem which got on my nerves after being so used to being able to type anything in, and following these steps fixed it.

My internet is on and I keep getting an alert window popping up saying the URL is not valid and can not be loaded?

I don't know what more details I can give you except for what I indicated. I am online and a window will pop up indicating the URL is not valid and can not be loaded. Make it stop! That's all! Furthermore you should not limit people on the length of their question. How can they explain it ?

Thats the annoying part! I have enough space and I'm putting things on a external hard drive and I keep deleting it off the computer.

Continously get an alert: "URL is not valid and cannot be loaded."

Every time I open a new page I see this error. Could it be connected to the Google Chrome add-on? I see that add-on the first few times I open a new tab then it disappears and I start getting this error.

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
See also:
*[[/questions/908165]] The URL is not valid and cannot be loaded

My Browser cannot load web pages. I get The URL is not valid and cannot be loaded"

I can no longer use Firefox. EVERY PAGE I attempt to load produces the following message alert: "The URL is not valid and cannot be loaded"
I have already cleared everything in my browser, rebooted my computer and absolutely nothing works. This just started happening constantly today.

Do other about: pages work properly?
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
See also:
*[[/questions/908165]] The URL is not valid and cannot be loaded

Tried to open Private browsing and get message "the url is not valid and cannot be loaded"

up graded Firefox directly from older version to latest version and problem cropped up. Latest version on my laptop which is out of service and in shop works fine and on my net book works fine. Should I have done it in steps?

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
See also:
*[[/questions/908165]] The URL is not valid and cannot be loaded

A Linux version fo Mozilla Firefox 6 Start Page states "The URL is not valid and cannot be loaded." - Why?

Hi, My Linux Mint (a Debian/Ubuntu flavor) when first seen, the Mozilla Firefox 6 Start Page was great. However, when moving away to other sites and then clicking home the response was Alert - "The URL is not valid and cannot be loaded." Having trying everything (apart from using a large club!) I am lost. Any suggestions team? Mark

Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
See also:
* https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
* http://kb.mozillazine.org/Preferences_not_saved

When i try to load any page on Mozilla 28 the page opens but i get additional tab saying The address isn't valid The URL is not valid and cannot be loaded.

When i try to load any page on Mozilla 28 the page opens but i get additional tab saying The address isn't valid The URL is not valid and cannot be loaded. I tried everything from reseting Firefox ,completely new installation of firefox to about.config and nothing worked it's been two days now since the problem started and i am pretty frustrated and desperate as i try to fix the issue so please help me with some solutions????
Big thanks in advance

Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.
You can use this button to go to the Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Preferences_not_saved

When I open firefox I get this message; The address isn't valid The URL is not valid and cannot be loaded.

I get this message whenever I open firefox or a new tab. Anything I had tabbed to the top has gone, and the original homepage which shows all my recent visits is invalid. The full message is:
The address isn't valid
The URL is not valid and cannot be loaded.
Web addresses are usually written like http://www.example.com/
Make sure that you're using forward slashes (i.e. /).
Try Again.
Help mee!!!

Hi fredmcd-hotmail
It's not that I'm typing anything in wrong, it's when I first open Firefox or a new tab. Instead of displaying the firefox page showing my recently viewed websites it's just an invalid URL. Why would I be blocked from this page?
Thanks

"invalid url "/" is not valid" only appears for my laptop

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