Any suggestions for avoiding this fetch failure error?

[Jaydeep Bagrecha]

Hi all,

        I am using nutch 1.10(with apache ant,ivy,tika) for crawling a few 
repositories.

        Getting this error for majority of urls.

"fetch of “url_name" failed with: java.net.ConnectException: Connection refused

        Could you suggest some ways to avoid this error?(have set the basic 
config settings like agent_name,agent_url etc correctly.)

Thanks,
Jaydeep