Hello All
After upgrading joomla to 3.5 (by ftp uploads) and updating to the latest K2 version (from site backend with joomla update manager) the when i trye to open media manager in frondend and in backend I got the follwing error :

Invalid backend configuration.
Readable volumes not available.

Hello,

Can you try disabling error reporting.
This setting can be found in your site's global configuration menu.

unfortunately after changing error reporting parameter the problem is not solved and it stays the same error.

With "none" or "system default" value I got this message :

Invalid backend configuration.
Readable volumes not available.

with "simple" , "maximum" and "developement" values, I got :

Invalid backend response.
Data is not JSON.

Ok, keep none for error reporting.
This could be related to a couple of causes.

a) Permissions, Please install Admin Tools from www.akeebabackup.com/downloads/admin-tools.html in order to fix your permissions as they should be and then reinstall the extension.

Right permissions on all joomla sites:
755 for folders
644 for files

Admin Tools can fix any read/write "file" permissions on your site, to what they should be. But, if your server's "owner" permissions for files are not properly setup, in other words, if Joomla cannot perform read/write operations via PHP, then it will not work properly.

b) Your hosting provider might be stoping symlinks from functioning.

I'm expring the sam problem and nothin of above have help me? There is now way to uploading images for me at this time in K2? When using "Item image" to upload nothing happens and when using "Brows on server" I get "Data is not Json"

What to do?

Thanks in advance
/Regards Thomas

Can you try disabling error reporting?
This setting is located in your site's global configuration options.

Hi and thanks for the answer. I have disabling error reporting. But it's still the same.
Regards Thomas

Do you still get DATA is not JSON or Invalid backend configuration.
Readable volumes not available.?

Hi, Yes! This is what I get: Invalid backend response.
Data is not JSON.

Regards Thomas

Check this topic also
www.joomlaworks.net/forum/k2-en/28435-resolved-invalid-backend-response-data-is-empty

Hi,

It's the same result :(
/Regards Thomas

Hi to all
according to my hosting provider symlinks are deactivated from functioning due to security reasons.
All my files an folders access rights are OK!

Hope to find other solution !
best regards

Thank you for sharing this Mohamed.
It will help a lot of users.

I got the answer from my internet provider.

the server delated two files "elFinderVolumeLocalFileSystem.class.php" ans "elFinderVolumeDriver.class.php" because they contain the expression "symlink".
LOG:

---

'/home/myaccont/public_html/administrator/components/com_k2/lib/elfinder/elFinderVolumeDriver.class.php
Regular expression match = [symlink\s*\(]
'/home/myaccount/public_html/administrator/components/com_k2/lib/elfinder/elFinderVolumeLocalFileSystem.class.php'
Regular expression match = [symlink\s*\(]

---

Thé expression 'symlink' is considérée as a signature of pirate. To evoid this problèmes it is recommandée to delete that expression from the two files and reupload thème.
En fait, l'expression "symlink" est considéré comme étant une signature de pirate
Pour dépasser ce souci, il vous suffit de supprimer l'expression en question de ces deux fichiers et de les réuploder sur le serveur à nouveau.

Hi,
Thanks Mohamed. So how do I delete Symlink expression there is a lot of Symlink expression in the files?

Thanks in advance!
/Thomas

Hi, All problem solved for me. I discovered that I had infected files on the server and by removing them, so it all is working again.

Thanks all for your help!
/thomas

Oh, I hope all is fine now Thomas.

Hi, It's all fine now! Thanks for asking. It was bit tricky.
Regards Thomas

Nice to know that Thomas.
Best of luck with your project.

Think you Teo, Thomas, Krikor and all,
I tried that is proposed by Teo but it does not work for me. The server deletes automatically any file which contains "symlink".
is there any way to change the the symlinks in the files code (listed abhove) ?