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You are still using topology net30 in your server config file.
It is only used for real old windows clients.
Where each client has his own network (each with 4 ip's)

a better option, and in the future only supported is
topology subnet

Change it in you config file (usually /etc/openvpn/server ...

The problem is the key is no longer vallid.

you can add the key from the PHP package base (sury.org)

After a lot of searching a found the problem.

the command less is used in my script.
Under normal use, under my login in bash it is
/usr/bin/less but is the same in /bin/less, /sbin/less and /usr/sbin/less -> vesion: less 692 (PCRE2 regular expressions)
Works perfect without problem.

But not when ...

I found a work around,
put all the output of the script to /dev/null in cron,
so it doesn't send mails. But this is not exactly what I want.
I want to know the rootcause.

I get the following errors when cron executes scripts

'unknown': I need something more specific.

It is new, since the last update of cronie.
It happens on several script. (But not all)
The version is : cronie (OpenRC) 0.63

You can turn it off in
opera://password-manager/settings

Sure it is crashing because of disk ?

You can disable mounting the disk in /etc/fstab
Just comment it out with #
or you can add noauto , so it doesn't mount at boot.
like for a cd-rom
# Device Mountpoint FStype Options Dump Pass#
/dev/cd0 /cdrom cd9660 ro,noauto 0 0

Or you can add nofail, so ...

You can use:
sudo hdparm -Tt /dev/sda

You should see something like this:
/dev/sda:
Timing cached reads: 15132 MB in 1.99 seconds = 7586.99 MB/sec
Timing buffered disk reads: 330 MB in 3.00 seconds = 109.86 MB/sec

or for M2 SSD:
/dev/nvme0n1p2:
Timing cached reads: 17356 MB in 2.00 seconds ...

You can choose to add a swap-file.
Similar to what windows does.

you create a swap-file, usually in root. But do it on the partition with the most space.
sudo fallocate -l 2G /swapfile

Usually you take 2 times the available ram, 1G ram x 2 = 2G swapfile.

Assign it read/write permissions for ...

This usually means you have the wrong ta.key installed on Server or client.

Check or Make sure the are the same.