Why does DNS resolution fail for one user account every 10 minutes on Yosemite

Network

My daughter has a user account on our iMac. She is not an administrator, and parental controls are not enabled.

When she logs in, she has about ten minutes of connectivity before host resolution fails. If she logs out, and logs back in, everything is OK for another ten minutes.

There is no spyware or malware on the machine.

When I log in as me, I have no such problems.

The dig command works fine; it can happily resolve hostnames. ping fails with an error indicating that it cannot resolve the same hostname.

Where should I begin looking to solve this vexing problem?

Best Answer

apparently a bug with yosemite... I had the same problem on my son's account... no ping while dig or nslookup were working fine... I have updated my mac with 10.10.1 (beta version available for developer) and everything is now back to normal..http://www.macrumors.com/2014/11/10/yosemite-10-10-1-build-14b23/

Related Solutions

MacOS – How to fix when I can nslookup and dig an internal hostname, but I cannot ping or ssh to the internal machine

Starting from Lion (except Yosemite between 10.10 and 10.10.3), the command for flushing the DNS cache is:

$ sudo killall -HUP mDNSResponder

There is a solution at https://superuser.com/questions/326848/strange-ns-behavior-on-os-x-cant-connect-to-ssh-server.

Why does the wifi internet access fail shortly after connecting to a LAN without internet access

You can adjust the order of your network interfaces in the Network panel of System Preferences. This allows you to set the primary adaptor for your network location, which in your case should be the Wi-Fi adaptor, since that provides the actual correct default route to the Internet.

The re-ordering UI is accessible by clicking on the 'gear' icon below the list of Network Adaptors on the left side of the Network Panel, and choosing "Set Service Order...".

You'll probably want to make & use a new Network Location for this setup, because in general (where either Ethernet or Wi-Fi provide valid default routes to the Internet), the Ethernet will be the better preference.

The same re-ordering can be useful for slightly unusual network setups, or VPNs where you may actually want all traffic to go through the VPN route (ie it should be the first service in the list) or maybe you only want the local subnet traffic on the VPN (ie your standard ethernet/wi-fi connections should precede it).

Best Answer

Related Solutions

MacOS – How to fix when I can nslookup and dig an internal hostname, but I cannot ping or ssh to the internal machine

Why does the wifi internet access fail shortly after connecting to a LAN without internet access

Related Question