Hi all,
To make a long story relatively short. I also encountered this issue. I tried all of the steps above and they did not solve my particular issue. I’m not saying that they don’t also solve variants of the issue, but they did not help me.
I did however manage to temporarily solve my issue though and I have reported it to Mikrotik as a bug along with supouts and everything else.
In my case I experience this issue when another Mikrotik device on the network is powered on. The problematic device does run a DHCP server but only on its wifi ports. It is connected to my main network over Ethernet though. I can’t explain why it is affecting my main networks DHCP but it clearly does. If I power this device off, the DHCP “client declined IP address” issues go away straight away. If I power it back up it comes back within minutes.
What I have ruled out:
- proxy-arp - http://forum.mikrotik.com/t/apple-devices-wont-connect/87675/1
- tkip - http://forum.mikrotik.com/t/apple-devices-wont-connect/87675/1
- Same failure on both 2.4G and 5G wifi
- Lease period is set to 3 days - http://forum.mikrotik.com/t/seen-this-dhcp-server-logs-client-declines-ip-several-times-a-second/108342/1
- Authoritative - http://forum.mikrotik.com/t/seen-this-dhcp-server-logs-client-declines-ip-several-times-a-second/108342/1
- Setting the bridge ports as trusted - https://wiki.mikrotik.com/wiki/Manual:Interface/Bridge
- It is not an Apple issue. I made no change to my apple device and could get it to both work and not work by making the change below. - http://forum.mikrotik.com/t/seen-this-dhcp-server-logs-client-declines-ip-several-times-a-second/108342/1 I have a wemo wifi switch which also failed to connect to the wifi.
- I am running the latest ROS version on all devices.
Turning the affected device off and on - did not help - Switching the affected device to flight mode - did not help.
- Switching the affected device’s wifi off and back on again after a few seconds.
- Firewall rules blocking the DHCP broadcasts.
Other people seemingly also affected by this issue:
http://forum.mikrotik.com/t/dhcp-server-client-declines-ip/61462/1
http://forum.mikrotik.com/t/seen-this-dhcp-server-logs-client-declines-ip-several-times-a-second/108342/1
http://forum.mikrotik.com/t/apple-devices-wont-connect/87675/1