Thanks guys,tried most of the stuff posted here, including running just 50 threads with 50 proxies with 180 timeout setting, but still getting those errors.
I am able to open sites manually in browser for which GSA is showing download error. My target list is fresh and verified.
Proxies working fine with all the other tools, so looks like issue with GSA SER.
I actually spoke with Sven about this yesterday and he said he has debugged this extensively this week and hasn't found any issue and said most of the time its the proxies going wild. All he did was add more detailed error messages so its throwing people off. People were use to just seeing "download failed" but now the error messages are more detailed. Also network issues cause these problems.
Keep in mind this message is going to happen no matter what at different times and that's normal. Of course if you aren't getting many links, that's the problem. Power users like Ron said he see's this message all over his log but still gets 400 LPM.
Here's what I use and my proxy settings and I'm getting great LPM.
Proxies: 50 shares proxies from proxy-n-vpn
Dedicated server: SSD 300 package from SolidSEOVPS
Proxy settings:
Here, after I test proxies, I'll sort them by clicking the speed column and uncheck the proxies that are slow. I usually uncheck proxies over 1.0 ms because even if proxies test as good, if they're slow they can still cause problems.
Nothing is checked here, but you can always test those last two options "proxies should resolve domain to IP" and "Try using proxy-keep-alive". You can toggle those on or off and see if that helps.
For captchas I'm using CB as my primary and Expert Decoders as a fallback.