Try Changing your Default Browser to Chrome or any other. Then reauthorize your account.
If that does not help disable your Firewall/Antivirus and try again.
Or Delete account from Flickr settings.Follow these steps:-
1. Go to your setting page (click on your icon/picture in the upper right corner and select settings)
2. Click on the Sharing & Extending tab.
3. Click edit to the right of Account Links
4. Delete the Lightroom account.
Go back into Lightroom and re-authorize.
Hope this helps
What is the error you are getting?
My default browser is Chrome, and I have tried reauthorising my account but I still get this error. I tried your steps via my Flickr account but it doesn't give me an option to edit in the account links, it doesn't even show that I am linked to Lightroom...?? but it allows me to authorise my Flickr account via Lightroom...
Here is a screen shot of the error I'm getting also what is shown in my Flickr account.
Thank you in advance,
This is a problem on Flickr's end. The only thing you can do is wait: Wait for a couple of minutes, retry. Then wait for a couple of hours. Then wait for a day. Usually the problem goes away. (Flickr has been getting less reliable over the past year or two as Yahoo enters its death spiral.)
Thank you for your feedback, I have had this problem for 2months now and have had to revert to uploading via my hard drive which is such a pain. Do you know any simples steps to convert my NEF images to JPEG so that I can upload them to Flickr? I am still a novice when it comes to technical stuff, I love taking photos but get stuck with all the post stuff...so any advice would be very much appreciated.
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For people running LR 5 and LR 6 / CC, that error message is invariably transient and goes away in a day or two. Perhaps there's another issue going on with LR 4 that isn't intermittent.
You could try this third-party Flickr plugin: Jeffrey Friedl's Blog » Jeffrey’s “Export to Flickr” Lightroom Plugin. Its author has an excellent reputation. The plugin is more complicated to set up than the builtin Flickr plugin, though it has more features.
Alternatively, you could try the free trial of LR 6 / CC 2015 and see if that fixes the problem. If it doesn't, you can always continue using LR 4.