To use them, all you have to do is create a "database" folder inside the installation directory of ClamAV and place them inside. The last two are, obviously, updated more rarely than the first. There are three different virus databases, namely the daily signatures, the main and the bytecode signatures. The ClamAV Virus Databases contain a package of updated virus definitions that you can use in case your computer goes offline. However, if you find yourself in a situation when you need to update ClamAV's signatures and no Internet connection is available, then the offline virus databases will surely serve you well. Needless to say, an active Internet connection in mandatory for the updater to be able to contact the ClamAV servers. The ClamAV manual contains instructions on how to set up this application. The only twist is that, this time, the updater runs as a console application named "freshclam", just like the ClamAV engine. The signature database contains information about the latest threats and allows the security tool to identify potentially suspicious files correctly.Īll antivirus solutions deploy integrated updaters to download the latest virus signatures and ClamAV (Clam Antivirus) makes no exception. Remember, understanding the error is the first step towards finding a solution.Using an antivirus to protect your computer against threats is useless if you don't keep the virus definitions up-to-date. For example, you can set ConnectTimeout 120 and ReceiveTimeout 120 to increase the time limit to 120 seconds.īy following these steps, you should be able to resolve the “No supported database files found” error and successfully use CLAMAV for scanning. Open the file /etc/clamav/nf using a text editor and modify the values. Lastly, if you have a slow internet connection and the database download is taking longer than the default time limit, you can increase the ConnectTimeout and ReceiveTimeout values in the freshclam configuration file. Sudo chmod 755 /var/lib/clamav Solution 6: Increasing the Time Limit for Downloading the Database The mkdir command is used to create directories, and the chmod command to set permissions as discussed earlier. If the /var/lib/clamav directory does not exist, it can be manually created and the correct permissions set. sudo chmod 755 /var/lib/clamav Solution 5: Manually Creating and Setting the Directory The command sudo chmod 755 /var/lib/clamav will give read and execute permissions to the owner, and read permissions to the group and others. If the permissions are incorrect, they can be changed using the chmod command. This command lists the files in the directory along with their permissions. You can check the permissions by running the ls -l /var/lib/clamav command. The user running the scan must have read access to the /var/lib/clamav directory. Solution 4: Checking File and Directory PermissionsĪnother possible cause of the error is incorrect file permissions. Wait for the update to complete before running the scan. If the utility reports that the database is locked, it means that the update is still in progress. This can be checked by running the sudo freshclam command. Sometimes, after the initial installation of CLAMAV, the database files are still being downloaded in the background. Solution 3: Waiting for the Database Update The configuration files are usually located in /etc/clamav/. You can check the configuration files for both freshclam and CLAMAV to ensure they are using the same directory. However, if the directory configuration has been changed, this could cause the error. By default, CLAMAV looks for the database files in the /var/lib/clamav directory. The next step is to ensure that the freshclam utility is updating the databases in the correct directory. sudo freshclam Solution 2: Checking the Database Directory The freshclam utility is a part of CLAMAV that downloads the latest virus definitions and updates the database. This can be achieved by running the sudo freshclam command in the terminal. The first and most straightforward solution is to update the CLAMAV database. This could be due to several reasons, such as the database not being updated, incorrect directory configuration, or incorrect file permissions. The error message indicates that CLAMAV is unable to find these database files in the directory /var/lib/clamav. CLAMAV uses a database of virus definitions to scan files. Solution 6: Increasing the Time Limit for Downloading the Database Understanding the Errorīefore diving into the solutions, it’s crucial to understand what this error means.Solution 5: Manually Creating and Setting the Directory.Solution 4: Checking File and Directory Permissions.Solution 3: Waiting for the Database Update.Solution 2: Checking the Database Directory.Solution 1: Updating the CLAMAV Database.
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