AntiVirus Essentials (ClamAV) has become increasingly unrelaible recently because Cisco are blocking people for updating 'too often' and older versions of Clam are simply no longer supported (DSM6.x). However, GEN offers a free mirror service to our customers which can be configured as below. You will need to obtain a GENCDN url from your account manager first. 

Enabling SSH, Configuring ClamAV on Synology NAS

To enable SSH access and configure ClamAV to use the GEN mirror for faster updates, follow these steps:

Step 1: Enable SSH Access

1. Log into DSM: Open a web browser and go to https://synologynas_ip>.
2. Access Control Panel:

• Navigate to Control Panel > SSH.

1. Enable SSH:

• Toggle the switch to enable SSH access.

1. Set Up User Access (if not already set up):

• Click on Advanced Settings.
• Create a new user or use an existing one with admin privileges.

Step 2: Connect via SSH

1. Open Terminal/SSH Client: Use PuTTY, SecureCRT, or another terminal client.
2. Connect to NAS:

• Enter the command: ssh username@synologynas_ip>

1. Authenticate:

• Follow the prompts to enter your password.

Step 3: Configure ClamAV

   cd /var/packages/AntiVirus/target/engine/clamav/etc/

   vi freshclam.conf

1. Update freshclam.conf as below replacing GENCDN with the CDN you've been issued:

   DatabaseOwner root
   UpdateLogFile /var/packages/AntiVirus/target/engine/clamav/var/freshclam.log
   LogVerbose false
   LogSyslog false
   LogFacility LOG_LOCAL6
   LogFileMaxSize 0
   LogTime true
   Foreground false
   Debug false
   MaxAttempts 1
   DatabaseDirectory /var/packages/AntiVirus/target/engine/clamav/var/lib
   DNSDatabaseInfo current.cvd.clamav.net
   AllowSupplementaryGroups false
   PidFile /var/packages/AntiVirus/target/engine/clamav/var/freshclam.pid
   ConnectTimeout 120
   ReceiveTimeout 0
   TestDatabases no
   Bytecode true
   # Check for new database 24 times a day
   Checks 24
   # DatabaseMirror database.clamav.net
   PrivateMirror http://GENCDN/clamav
   ScriptedUpdates no

1. You may need to read up on using vi as an editor or install the nano third party package for a more usual editing experience. 

1. Save and Exit: 

• Verify the Update:

• Check if the update was successful by navigating to Synology > Control Panel > Anti-Virus and looking for recent updates..

By following these steps, you should be able to enable SSH access and configure ClamAV to use the GEN mirror for faster updates. This will help ensure your Synology NAS remains well-protected against new threats.