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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

Solutions on the web

via Spring JIRA by Eric PErez, 2 years ago
I/O error on GET request for "http://hadoop1.example.com:34549/modules?size=10000":hadoop1.example.com; nested exception is java.net.UnknownHostException: hadoop1.example.com
via Google Groups by Ludovic Deravet, 1 year ago
I/O error: Stream closed; nested exception is java.io.IOException: Stream closed
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