I get the "System error 13: Permission denied" error in Plesk CP during some operation.

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APPLIES TO: Parallels Plesk Panel for Linux/Unix

http://kb.parallels.com/en/1528

Resolution

CAUSE:

Most probably Plesk Admin Apache cannot access some file because of lost 'SUID' bit on the wrapper.


RESOLUTION:

Make sure that the following files have proper permissions:


# ls -al $PRODUCT_ROOT_D/admin/sbin/*wrapper
---s--x---  1 root psaadm 13120 Jun 13 21:51 ./admin/sbin/mod_wrapper
---s--x---  1 root psaadm 13632 Jun 13 21:51 ./admin/sbin/wrapper


If you see different permissions, use the "chmod 4110" command to correct them.

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