when running full crawl gets time out error

Hi,

When running full crawl gets timeout error everytime

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This item could not be crawled because the repository did not respond
within the specified timeout period. Try to crawl the repository at a later
time, or increase the timeout value on the Proxy and Timeout page in search
administration

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We have set timeout to 120 seconds and unchecked the automatically detect seetings from the internet option. But still no luck. Am I missing something? in which server we need to uncheck the automatically dettect setting in the IE.

Please assist asap.