Category Archives: Plesk

Fix “There is no suitable CSPRNG installed on your system” in Plesk

After updating paragonie/random_compat you may get this error. This is caused because version 2.0 stopped using OpenSSL and now it uses /dev/urandom which may not be readable by your PHP configuration. This is fixed adding /dev/urandom to your open_base configuration in “Websites & Domains -> PHP Settings -> open_basedir”:



Adding PHP 7.0 support in Plesk

First thing you need to do is update to Plesk 12.5 (currently 12.5.30). For that you have to go to Server options, “Plesk->Updates and Upgrades” and then go to “Install or Upgrade Product”. You may get some warnings in case you installed third party modules so you should better remove them (it happended to me with mod_security) before doing the upgrade. As you can see I’ve already updated to 12.5.30 so I can’t show you the proper image but the options are just the same.


Once you have Plesk updated the actual magic, in Linux systems, is done with this command (runned as root):

# plesk sbin autoinstaller --select-product-id plesk --select-release-current --install-component php7.0

Full PHP 7.0 install process log:

The nice thing about it is that you can just change the PHP version number to install another one, for example if you have a domain with an app that needs to run in a legacy PHP 5.2 version:

# plesk sbin autoinstaller --select-product-id plesk --select-release-current --install-component php5.2

Now you can select an specific PHP version for different domains by just setting it in the “PHP Settings” option. Before:


Changing the PHP version to 7.0:





Fix “This field was locked by vendor” in Plesk Updates source and installation settings

I was trying to install some new components to one on my Plesk managed servers but I got this error when going to “Server > Tools & Settings > Plesk > Updates and Upgrades”:

Failed to read product information from the file : Can't process products.inf3: Failed to download the package The requested URL returned error: 404 Can't process versions.inf3: Failed to download the package The requested URL returned error: 404

I asked OVH technical service and they told me more or less this: “Yep, that URL is no longer available but we only provide it on first automated install. Fix it yourself.”. I have to say that this happened with the customer service from Spain, something that of course didn’t surprise me. We are used to this kind of “help” from customer services here.

So I tried to change the product information source to the official Plesk one but I noticed that the field was disabled, as it said “This field was locked by vendor.”.


I started to search for the original URL in /root/parallels in order to edit it with no luck. When I did a search for this problem on the Internet I got to the most surreal fix I’ve ever come around: Open the browsers devtools and remove the “disabled” option to the “URL to the directory with .inf3 file” input field, change the URL to the correct one ( and click “Save”. It worked!