Connection time out error even though php set time limit is set to 0

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http://serverfault.com – I get following message in my php application: This request takes too long to process, it is timed out by the server. If it should not be timed out, please contact administrator of this web site to increase 'Connection Timeout'. Even though i have kept this code set_time_limit(0); How do we fix connection time out issue? (HowTos)