安装clamav出现问题

[ps3wifi]

Trying again in 5 secs...
ClamAV update process started at Wed Dec 2 18:23:26 2015
WARNING: DNS record is older than 3 hours.
WARNING: Invalid DNS reply. Falling back to HTTP mode.
WARNING: Can't download main.cvd from db.local.clamav.net
Trying again in 5 secs...
一直出现上面信息,ping db.local.clamav.net又是通的,麻烦问下各位这种该怎么解决,移动的线路