We have installed ClamAV from the WHM/Cpanel plugin manager; the installation process was successful but when we try to launch a scan we see that the process hangs; it seems that the clamd daemon is not started. The web interface displays the message:
Scanning:… connecting to clamd service …
It Seems that ClamAV was not installed completely,For solution in Main >> Server Configuration >> Tweak Settings,check the value for The maximum memory a cPanel process can use before it is killed off (in megabytes).
By Default it is 256, Change it to 512. Then, uninstall and reinstall ClamAV using Main >> cPanel >> Manage Plugins.
It should take much longer to install ClamAV this time, But it should work when the installation is finished.
If your CalmAV virus database is outdated you can update ClamAV virus database by following simple steps.