I'm not sure whether you have tried the "usual" things:

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Command+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

• "3-bar" menu button (or Tools menu) > Options > Advanced
• Firefox menu > Preferences > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click and choose View Page Info > Security > "View Cookies"
• classic Tools menu > Page Info > Security > "View Cookies"

In the dialog that opens, you can remove the site's cookies individually.

Then try reloading the page. Does that help?

In case one of your extensions is involved, could you test the page in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: Diagnose Firefox issues using Troubleshoot Mode.

You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

Not all add-ons are disabled: Flash and other plugins still run

After Firefox shuts down, a small dialog should appear. Click "Start in Safe Mode" (not Reset).

Any difference?

Oh, hang on, there was a change. The"NTLM" authentication method used by some Microsoft web servers is less secure on Mac than on Windows. Starting in Firefox 30, that older generation method is disabled as being too insecure.

To connect using that method, you need to re-enable support under the covers. See:

For background:

• Firefox 30 Security Error. [Mac] • mozillaZine Forums
• https://developer.mozilla.org/en-US/Firefox/Releases/30/Site_Compatibility#Security

The workaround:

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the search box above the list, type or paste ntlm and pause while the list is filtered

(3) Double-click the network.negotiate-auth.allow-insecure-ntlm-v1 preference to switch it from false to true

I have not tested this myself (this preference does not exist on Windows), and am not fully aware of the security implications.

Does this seem to help?

Thank you!!! The workaround worked perfect :)

Anne

Thank you, jscher2000, that fixed it for me too.

I agree that there can be security implications. I just hope that, while I am "out and about" my laptop doesn't try to connect to a spoofed version of an internal-to-my-company server.......