Wordpress error 500 (Debian 7, nginx)

Hello,

I have migrated site from shared hosting (Apache) to my VPS running Debian 7, nginx and I get error 500.
My error.log file is over 800 MB (!?!) and it is full of lines like this:

Code:

2015/02/05 21:41:24 [error] 5105#0: *14 FastCGI sent in stderr: "sedir restriction in effect. File(/) is not within the allowed path(s): (/var/www/clients/client1/web3/web:/var/www/clients/client1/web3/private:/var/www/clients/client1/web3/tmp:/var/www/goinfobl.com/web:/srv/www/goinfobl.com/web:/usr/share/php5:/usr/share/php:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin) in /var/www/clients/client1/web3/web/wp-includes/functions.php on line 1497
PHP message: PHP Warning:  is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/var/www/clients/client1/web3/web:/var/www/clients/client1/web3/private:/var/www/clients/client1/web3/tmp:/var/www/goinfobl.com/web:/srv/www/goinfobl.com/web:/usr/share/php5:/usr/share/php:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin) in /var/www/clients/client1/web3/web/wp-includes/functions.php on line 1497
PHP message: PHP Warning:  is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/var/www/clients/client1/web3/web:/var/www/clients/client1/web3/private:/var/www/clients/client1/web3/tmp:/var/www/goinfobl.com/web:/srv/www/goinfobl.com/web:/usr/share/php5:/usr/share/php:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin) in /var/www/clients/client1/web3/web/wp-includes/functions.php on line 1497
PHP message: PHP Warning:  is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/var/www/clients/client1/web3/web:/var/www/clients/client1/web3/private:/var/www/clients/client1/web3/tmp:/var/www/goinfobl.com/web:/srv/www/goinfobl.com/web:/usr/share/php5:/usr/share/php:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin) in /var/www/clients/client1/web3/web/wp-includes/functions.php on line 1497
PHP message: PHP Warning:  is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/var/www/clients/client1/web3/web:/var/www/clients/client1/web3/private:/var/www/clients/client1/web3/tmp:/var/www/goinfobl.c

I followed this: https://www.howtoforge.com/community/threads/wordpress-multisite-get-an-502.57031/#post-278108
Tried adding only

Code:

location / {
                try_files $uri $uri/ /index.php?$args;
       }

in nginx directives (under options) but nothing seems to work :/

Please help...

 

Strangely, I AM able to log in to the admin console but still get errors when accessing the site.

 

SUCCESS!!!
All I did was to change the path in Settings > Media > Store uploads in this folder to
/var/www/clients/client1/web5/web/wp-content/uploads
and THAT did the trick
Unbelievable! How could the upload path to media store be so damn important!?!

I even deleted that site from ISPconfig and made a new one so now client1/web4 is empty (I managed to delete all the files and folders in that folder, even the error folder).
Is there a way to "reclaim" that folder and reset it to default settings?
I tried to copy original error files from /usr/local/ispconfig/server/conf/error/ to /var/www/clients/client1/web4/web/error/ but even though the files are in the destination folder, the default error pages were not shown (I did that prior to deleting site in web4).
So basically, this thread is about reclaiming the folder.

 

Thank you for your response @till
Wordpress stopped trying to access the server root only after I changed media storage folder. I still can not believe that the site would not load because of this.
I just looked, there is no web 4 folder under /var/www/clients/client1/ only web1 and web4
Does that mean that when another site is created for client1 there is goingo to be web6? If yes, what about those in between (or I should not be bothered with such trivial questions)?

 

That log file is prior to deletion of site from ISPconfig, when I was still trying to figure out what is wrong.