Grsec issue after kernel update to 4.5

Hi guys & gals

It seems installing kernel 4.4 from backport broke my debian 8 (VM over proxmox) due to some grsec issue. If anyone can help, I don’t know much about those enhanced security stuff.

So basically I can’t SSH in or open yunohost through my browser, here’s my SSH attempt

$ ssh yunohost

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Jun 26 21:38:33 2016 from 10.35.0.254
/bin/bash: Permission denied
Connection to yunohost closed.

Here’s my server console, after reboot

I had the same kind of message yesterday after a failed SSH or opening owncloud web page, but curiously couldnt reproduce it this morning.

So, if anyone can tel me at least how to disable this security layer while I’m investigating, that would be far more convenient than server console without copy/paste and a weird keymap !

Best regards,