L2TP/IPSEC stop working until i reboot

[Cinerar]

Nanoboot 5.0-4493 Update 5

L2TP/IPSec VPN from package center

Server is behind Router, ports forwarder.

Boot up, everything is working fine, i can connect from network or from internet.

After some time, even 48 hours some time, connection couldn't be established from network or internet.

If i restart L2TP/IPSec it doesn't help, just can't connect.

If I reboot xpenology, everything is working fine for another day or so.

Any ideas?

[Cinerar]

VisualRecord> netstat -anltp | grep "LISTEN"
tcp        0      0 0.0.0.0:161             0.0.0.0:*               LISTEN      15109/snmpd
tcp        0      0 0.0.0.0:49160           0.0.0.0:*               LISTEN      17135/synovpcd
tcp        0      0 0.0.0.0:6281            0.0.0.0:*               LISTEN      14679/img_backupd
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN      15265/smbd
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      10410/sshd
tcp        0      0 0.0.0.0:631             0.0.0.0:*               LISTEN      15262/cupsd
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      14671/postgres
tcp        0      0 127.0.0.1:18617         0.0.0.0:*               LISTEN      17135/synovpcd
tcp        0      0 192.168.1.35:3260       0.0.0.0:*               LISTEN      -
tcp        0      0 127.0.0.1:4700          0.0.0.0:*               LISTEN      14520/cnid_metad
tcp        0      0 0.0.0.0:3261            0.0.0.0:*               LISTEN      -
tcp        0      0 0.0.0.0:445             0.0.0.0:*               LISTEN      15265/smbd
tcp        0      0 0.0.0.0:3262            0.0.0.0:*               LISTEN      15418/isccore
tcp        0      0 ::%134910348:161        ::%134910348:*          LISTEN      15109/snmpd
tcp        0      0 ::%134910348:515        ::%134910348:*          LISTEN      15007/inetd
tcp        0      0 ::%134910348:548        ::%134910348:*          LISTEN      14641/afpd
tcp        0      0 ::%134910348:5000       ::%134910348:*          LISTEN      15906/httpd
tcp        0      0 ::%134910348:139        ::%134910348:*          LISTEN      15265/smbd
tcp        0      0 ::%134910348:5005       ::%134910348:*          LISTEN      14728/httpd
tcp        0      0 ::%134910348:80         ::%134910348:*          LISTEN      15003/httpd
tcp        0      0 ::%134910348:22         ::%134910348:*          LISTEN      10410/sshd
tcp        0      0 ::%134910348:631        ::%134910348:*          LISTEN      15262/cupsd
tcp        0      0 ::%134910348:445        ::%134910348:*          LISTEN      15265/smbd
VisualRecord>

this is what happens when L2TP is not avialible