>  from a desktop-pc I tried to use the portable
> version,in a public library. All I got was an error
> message. I suspect there is a proxyserver, also I
1) Always post the command line used (log file line two) 
2) Always post anything useful in the log. Do you really expect an answer when
you give NO INFORMATION
If your browser uses a proxy, then so will HTT with the SAME settings.