Granting CAP_SETUID as it seems to be needed

systemd/softether-vpnbridge.service

@@ -16,7 +16,7 @@ ProtectHome=yes
 ProtectSystem=full
 ReadOnlyDirectories=/
 ReadWriteDirectories=-/opt/vpnbridge
-CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_ADMIN
+CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_ADMIN CAP_SETUID
 
 [Install]
 WantedBy=multi-user.target

systemd/softether-vpnclient.service

@@ -17,7 +17,7 @@ ProtectHome=yes
 ProtectSystem=full
 ReadOnlyDirectories=/
 ReadWriteDirectories=-/opt/vpnclient
-CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_ADMIN
+CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_ADMIN CAP_SETUID
 
 [Install]
 WantedBy=multi-user.target

systemd/softether-vpnserver.service

@@ -17,7 +17,7 @@ ProtectHome=yes
 ProtectSystem=full
 ReadOnlyDirectories=/
 ReadWriteDirectories=-/opt/vpnserver
-CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_ADMIN
+CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_ADMIN CAP_SETUID
 
 [Install]
 WantedBy=multi-user.target