Plesk VPN extension: installation fails

[Reinhard_Hutter]

Installation of the Plesk VPN extension reproducibly fails on Debian Wheezy

Plesk 12.0.18 Update #24
Debian 7.7 Kernel 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3+deb7u2 x86_64 GNU/Linux

Steps to reproduce:

1. Plesk Panel > Updates and Upgrades > Install "Plesk VPN extension"
2. Green Message "All operations with products and components have been successfully completed."
3. Going back from Upgrade window to Plesk Panel Home
4. Yellow Warning "Upgrade failed. To remove this notice, remove the file /var/lock/parallels-panel-upgrade-failure.flag from the server. Repair the failed upgrade or installation."
5. (VPN extension does not show up in extensions tab)
6. Clicking "Repair the failed upgrade or installation" executes, but does not help
7. Uninstall and Reinstall Plesk VPN extension in "Upgrades and Updates" does not help

What I already have tried:
Shell > apt-get install psa-vpn

Getting error mossage:
Setting up psa-vpn (12.0.18-debian7.0.build1200140606.15) ...
ERROR: could not insert 'tun': Unknown symbol in module, or unknown parameter (see dmesg)

Shell > modprobe tun
ERROR: could not insert 'tun': Unknown symbol in module, or unknown parameter (see dmesg)


I'm out of ideas now, can anybody tell me what's going wrong here?

TiA
Reinhard

 

[Reinhard_Hutter]

Addendum:

Shell > dmesg
[8034518.524254] tun: Unknown symbol ipv6_proxy_select_ident (err 0)

 

[UFHH01]

Please downgrade your kernel. The issue is known on several bugtrackers and not solved yet.

 

[Reinhard_Hutter]

Thanks, changing the kernel helped, everything works fine now