I am experiencing the following issue in our organization:
DHCP server is Windows Server 2016. Lease time is 3 days.
Equipment: Sophos XG firewall; Cisco C9300 switch; Cisco WLC2504 is providing WIFI network in the office together with AIR-AP3802I APs.
The strange thing is that WIFI users connected to the internal network loose connection after some time and get the default IP address 169.xx.xx.xx . If I restart APs, the device affected laptop gets connected again.
Another strange thing is that all laptops connected to the WIFI tries to renew the IP address every 30 minutes even though the renewal should happen every 1,5 days (lease time / 2) .
Does anyone have some good suggestion?
Thank you in advance.