disconnects after inactivity

[Saruzzu]

Hello, my vpn is disconnects if left inactive.

Mon Oct 26 14:18:04 2015 TLS: soft reset sec=0 bytes=2628562/0 pkts=19094/0
Mon Oct 26 14:18:05 2015 VERIFY OK: depth=1, C=IT, ST=TRAPANI, L=Campobello di Mazara, O=iamc.cnr.it, OU=Capo Granitola, CN=IAMC CNR CA, emailAddress=tech-c@iamc.cnr.it
Mon Oct 26 14:18:05 2015 VERIFY OK: depth=0, OU=Hosts, CN=zs.iamc.cnr.it
Mon Oct 26 14:18:08 2015 Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key
Mon Oct 26 14:18:08 2015 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Mon Oct 26 14:18:08 2015 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key
Mon Oct 26 14:18:08 2015 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Mon Oct 26 14:18:08 2015 Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA
Mon Oct 26 15:18:05 2015 TLS: tls_process: killed expiring key
Mon Oct 26 15:18:08 2015 TLS: soft reset sec=0 bytes=2212562/0 pkts=18133/0
Mon Oct 26 15:18:10 2015 VERIFY OK: depth=1, C=IT, ST=TRAPANI, L=Campobello di Mazara, O=iamc.cnr.it, OU=Capo Granitola, CN=IAMC CNR CA, emailAddress=tech-c@iamc.cnr.it
Mon Oct 26 15:18:10 2015 NOTE: --mute triggered..

This is the last message.
Can you help me?

bye

[Traffic]

You should probably contact your technical support operative:
tech-c@iamc.cnr.it

From this:

VERIFY OK: depth=1, C=IT, ST=TRAPANI, L=Campobello di Mazara, O=iamc.cnr.it, OU=Capo Granitola, CN=IAMC CNR CA, emailAddress=tech-c@iamc.cnr.it