started seeing a lot of download failed's

Using 150 private proxies which are testing good but I've started seeing a lot of download fails. What else could cause that besides dead proxies?

A too low timeout, blocked by firewall/anti virus or blocked proxies on the remote server.

I had this problem a few days ago. I tried everything I could think of - timeout, rebooted my PC, restarted my cable modem & router, proxies all tested fine (multiple times with different programs), lowered nbr of threads, even ran different releases of SER).

I could never figure it out. Then it just went away...so...I don't know. Hope yours just "goes away" too.