1

Hello All,

We have recently installed Unifi Wifi in our buildings. Using our internal DHCP and DNS servers, no Unifi Gateway installed at this point. Things are working fine although I continually see these “anomolies” and wondered if anyone may be able to point me toward resolving this. I’ve checked out my network DHCP and DNS and both seem to be functioning well. Unifi kicks out these messages daily on the hour:

4:00pm
Client iPhone is having trouble resolving a domain name to an IP address (DNS timeout).for last 2 hours
4:00pm
High DNS latency for Client KIOSK for last 12 hours
Any thoughts? Thank you!

11 Spice ups
2

You will need to track down one of the reported devices to see if it is indeed having DNS issues and what its local settings are. It is entirely possible that the user of that device has manually set DNS servers that can’t be reached

3

Hi Molan,

Unfortunately, that is not the case. There are multiple devices with this issue and random checks indicate that the DNS/DHCP IP addresses are that of my internal servers, so they are pulling the correct information. Thank you!

4

If the devices are being handed the correct DNS issue then the next step is to look at your network and the route the devices have to take to reach that DNS server. Are they actually able to traverse the route? is the DNS server on the same VLAN and Subnet? Are Guest policies in play? Is there a firewall in the path? Etc

5

If you have a stupid DNS client (like an iPhone) and they have a stupid app that is running and it’s making constant queries trying to resolve a host name like this.address.no.longer.exists.com from a crazy service for an app company that went bankrupt a year ago then the “Client iPhone is having trouble resolving a domain name to an IP address (DNS timeout)” for hours :slight_smile:

6

I have a dozen clients that use all Unifi AP’s and everything is setup correctly. You ALWAYS see those messages and there is nothing wrong. Just like any Android and iPhone, they are constantly communicating with adware and junk. I’ve never had an end user call and say they were having a problem accessing anything so I would just ignore those messages.

Some of our clients use Cisco Umbrella so devices can’t resolve DNS to things that are being blocked.

1 Spice up
7

Thanks everyone for your insight!