When I upgrade the Oracle Virtualbox to 4.3.22, I got " connection 'Wired connection 1' activated" and " connection 'Wired connection 1' deactivated" in my guest OS, Kubuntu 14.04. In syslog, the following messages are repeated. This happens every a few minutes. --- Feb 19 00:47:55 hitoshi-kubuntu-14 NetworkManager[683]: (eth0): IP6 addrconf timed out or failed. Feb 19 00:47:55 hitoshi-kubuntu-14 NetworkManager[683]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled... Feb 19 00:47:55 hitoshi-kubuntu-14 NetworkManager[683]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started... Feb 19 00:47:55 hitoshi-kubuntu-14 NetworkManager[683]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete. --- Activate and deactivate network frequently Host OS: Windows 7 Guest OS: Kubuntu 14.04 Oracle Virtualbox 4.3.22r98236 Also I found the same problem with CentOS: https://www.centos.org/forums/viewtop
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