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Netbeans has proxy settings enabled (Tools/Options -> Proxy settings -> manual proxy settings -> proxy.mycompany.com) but I am not connected to the company network so the proxy is not available. So, if I execute "Show changes", I correctly get org.apache.subversion.javahl.ClientException: E175002: unknown host E175002. But if I disable the proxy settings (select no proxy in the config dialog) it works for Netbeans itself (e.g check for updates) but for subversion the proxy settings seem to stay active and the above error stays. The only way to resolve this is to restart Netbeans. The other way round (start without proxy, enable proxy) works. Tested with Netbeans 8.1 and NetBeans IDE Dev (Build 201606010002)