pivpn: [Support] Wireguard connection suddenly don't work anymore[partly fixed, remaining error in debug]

• I have read and understood the contributors guide.
• [unsure how my issue came up so I don’t know] The issue I am reporting can be replicated.
• [unsure] The issue I am reporting can be is directly related to the pivpn installer script.
• The issue I am reporting isn’t a duplicate (see FAQs, closed issues, and open issues).

Issue

I used PiVPN with wireguard for several month without any issue. Today suddenly the VPN connection didn’t worked anymore. I logged on the raspberrypi and tried to find out what the problem is. pivpn -c --> Unable to access interface: Protocol not supported pivpn -d --> ::: Missing setup vars file!

I checked the folder /etc/pivpn/SetupVars.conf file exists. I checked the content of the SetupVars.conf file it is the same like in my backup of the raspberry pi sd card. I checked the content of /etc/wireguard/wg0.conf, seems also to be the same as before in my backup.

I found this reddit post : reddit and there was a guide linked --> guide I followed this guide: apt update apt upgrade apt install raspberrypi-kernel-headers --> output raspberrypi-kernel-headers is already installed (1.20201022-1) reboot now apt reinstall wireguard-dkms

Then pivpn -c showed again my client list. But I still get pivpn -d --> ::: Missing setup vars file!. I checked the folder /etc/pivpn/SetupVars.conf file exists. According to FAQ there should be a sub-folder wireguard --> /etc/pivpn/wireguard/setupVars.conf I now manually copied the setupVars.conf file to /etc/pivpn/wireguard/setupVars.confand run again pivpn -d:

And got the again complete debug output. But at the top I got the following error:

::::		Latest commit		 ::::
fatal: Kein Git-Repository: '/usr/local/src/pivpn/.git'

Have you searched for similar issues and solutions?

(yes/no / which issues?)

Yes, see explanation above.

Console output of curl -L install.pivpn.dev | bash

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    17  100    17    0     0     57      0 --:--:-- --:--:-- --:--:--    57
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (35) error:14094438:SSL routines:ssl3_read_bytes:tlsv1 alert internal error

Console output of pivpn debug

::::		PiVPN debug		 ::::
=============================================
::::		Latest commit		 ::::
fatal: Kein Git-Repository: '/usr/local/src/pivpn/.git'
=============================================
::::	    Installation settings    	 ::::
PLAT=Raspbian
OSCN=buster
USING_UFW=0
IPv4dev=eth0
dhcpReserv=1
IPv4addr=xxx
IPv4gw=xxx
install_user=xxx
install_home=/home/xxx
VPN=wireguard
pivpnPORT=xxx
pivpnDNS1=xxx
pivpnDNS2=
pivpnHOST=REDACTED
INPUT_CHAIN_EDITED=0
FORWARD_CHAIN_EDITED=0
pivpnPROTO=udp
pivpnDEV=wg0
pivpnNET=xxx
subnetClass=xxx
UNATTUPG=1
INSTALLED_PACKAGES=(raspberrypi-kernel-headers wireguard wireguard-tools wireguard-dkms qrencode)
=============================================
::::  Server configuration shown below   ::::
[Interface]
PrivateKey = server_priv
Address = xxxx
ListenPort = xxx
# begin xxx
[Peer]
PublicKey = xxx_pub
PresharedKey = psk
AllowedIPs = xxx
# end xxx
# begin xxx
[Peer]
PublicKey = xxx_pub
PresharedKey = psk
AllowedIPs = xxx
# end xxx
# begin xxx_work
[Peer]
PublicKey = xxx_pub
PresharedKey = psk
AllowedIPs = xxx
# end xxx
# begin xxx
[Peer]
PublicKey = xxx_pub
PresharedKey = psk
AllowedIPs = xxx
# end xxx
=============================================
::::  Client configuration shown below   ::::
[Interface]
PrivateKey = xxx
Address = xxx
DNS = xxx

[Peer]
PublicKey = server_pub
PresharedKey = psk
Endpoint = REDACTED:xxx
AllowedIPs = 0.0.0.0/0, ::0/0
=============================================
:::: 	Recursive list of files in	 ::::
::::	[4m/etc/wireguard shown below	 ::::
/etc/wireguard:
configs  keys  wg0.conf

/etc/wireguard/configs:
clients.txt  xxx.conf	xxx.conf	xxx.conf  xxx.conf

/etc/wireguard/keys:
xxx_priv  xxx_priv  m_smartphone_priv  xxx_priv  psk	   server_pub
xxx_pub   xxx_pub   xxx_pub   xxx_pub   server_priv
=============================================
::::		Self check		 ::::
:: [OK] IP forwarding is enabled
:: [OK] Iptables MASQUERADE rule set
:: [OK] WireGuard is running
:: [OK] WireGuard is enabled (it will automatically start on reboot)
:: [OK] WireGuard is listening on port xxx/udp
=============================================
:::: Having trouble connecting? Take a look at the FAQ:
:::: https://github.com/pivpn/pivpn/wiki/FAQ
=============================================
:::: WARNING: This script should have automatically masked sensitive       ::::
:::: information, however, still make sure that PrivateKey, PublicKey      ::::
:::: and PresharedKey are masked before reporting an issue. An example key ::::
:::: that you should NOT see in this log looks like this:                  ::::
:::: YIAoJVsdIeyvXfGGDDadHh6AxsMRymZTnnzZoAb9cxRe                          ::::
=============================================
::::		Debug complete		 ::::

Have you taken any steps towards solving your issue?

Some steps from reddit, see explanation at the top.