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Well, the no_proxy implementation is not really full featured. Here is a list of upstream RFE tickets which might be relevant: https://bugs.ruby-lang.org/issues/10251 https://bugs.ruby-lang.org/issues/8317 (this included patch, you probably want to test it if it helps) https://bugs.ruby-lang.org/issues/12062
So it seems upstream applied the patches from https://bugs.ruby-lang.org/issues/8317 https://bugs.ruby-lang.org/issues/12062 as well. I requested backport to older versions as well: https://bugs.ruby-lang.org/issues/12421 Would you mind to test which of the patches resolves the issues you describe above?
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHEA-2016-2422.html