Log in with LinkedIn not working anymore

Paulos,
Something is preventing the normal redirection process for JLinked and LinkedIn. The place I'd start looking is in your SEF or translation extension. Try disabling one, or both, and test again to see if it works. Then, re-enable each on individually to narrow things down. If it's your SEF extension, see if you can have it 'skip' altering the URLs of JLinked.

I hope that helps get you started, but if not, let us know what you find with the tests above.

Thanks,
Alex

Paulos,
I'm not sure what's happening. JLinked hasn't changed in the last week (or month) as well, so it's not a change on our end. That leaves either LinkedIn, which is unlikely since we haven't heard of this issue from others, or a change in behavior on your site.

The only other thing I forgot to mention above was a possible caching issue. Can you disable caching in the Global Configuration area of Joomla and the System - Cache plugin, if enabled, and try one more time?

If that doesn't work, feel free to private message us some admin credentials and we'll gladly investigate further.

Thanks,
Alex

Thanks for the admin credentials. In the admin area of JLinked, I enabled the "Display API Errors on Front-end" setting. Then, when logging in, I got the following message:

JLinked API Error: OAuth callback URL was not confirmed by the LinkedIn end-point (signature_invalid)
From:https://api.linkedin.com/uas/oauth/requestToken?scope=r_emailaddress

That indicates that there's a communication problem between your site and LinkedIn. That could be due to a change in your server's configuration (usually a firewall block) or something on-site, like an incorrect redirection. There's nothing I can see in your Joomla configuration that would be causing issues. I tried to disable Joomfish as much as I could (though disabling all 4 system plugins resulted in a redirect loop for some reason).

The best thing I'd recommend now is contacting your hosting provider and making sure that your server is able to communicate with the following URL:

api.linkedin.com/

Since nothing has changed on your site, LinkedIn, or JLinked to cause this, the only thing left is that your hosting provider changed a configuration setting somewhere.

Hopefully, they'll be able to help verify that there is no blockage to that URL, or outgoing requests in general, from your server. We'll gladly help investigating further, but there's not much I can do at this point.

Thanks,
Alex

Alright.. things seem to be working again. The problem is that your server time has drifted and is no longer accurate. For security purposes, LinkedIn rejects requests that are sent more than 15 minutes off of 'real time'. Your server just entered this boundary, and that's where the failures we're coming from. JLinked actually has a built-in correction for this, but it relies on LinkedIn returning a specific error stating that the Timestamp is incorrect. It seems like there's a bug with LinkedIn where, if you're pretty much exactly 15 minutes incorrect, they just fail the request but don't let us (JLinked) know why.. which prevents our auto-correction.

There were no code changes to JLinked required, just a 'force' of our timestamp correction to fix things. I'd recommend using a tool on your server to keep the Timestamp in up to date. There are many tools to do this, or your host should already be doing it.

Finally, I disabled the User - Contact Creator plugin as it was preventing me from deleting users and re-registering. Feel free to re-enable it if you need it, or disable it for testing purposes.

I hope that helps,
Alex