.xml license code through Plesk GUI, it gives a
502 bad gateway ' and will not install.
Plesk is installed on the server running CloudLinux.
The following error can be found in
[20-Jan-2015 07:07:52] WARNING: [pool plesk] child 916486 exited on signal 9 (SIGKILL) after 10.786705 seconds from start
[20-Jan-2015 07:07:52] NOTICE: [pool plesk] child 916938 started
This is known issue for CloudLinux, which is caused by
ptrace block. Details can be obtained in CloudLinux documentation .
This behavior has been confirmed as bug with internal id #PPPM-2446 . It was fixed in Plesk 12.5.
For Plesk 12.0, as a workaround set
kernel.user_ptrace value to
# sysctl kernel.user_ptrace=1
kernel.user_ptrace = 1
Then re-upload the license.