There are some answers on SOF but in my case this was caused by no more disk space.
Checked permissions and they had the web server user www-data with write access to all app/tmp/*
Checked the /var/log/apache2/error.log and found a “no space left on the device warning”
Therefore did a disk clean up and suddenly started working again
Get a list of remote desktop sessions via Command Line
qwinsta # or query session
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