We had upgraded 3 of our firewalls in the last week. Those were ASA 5510s and were running on 8.2(2)16 before. They were upgraded to 8.4(4) last week. We have Wireless Access Points in the external segment (outside firewall) and after the firewall was upgraded, we saw that 3 of our wireless APs could not get IPs (the DHCP server resides in internal LAN segment), while the other three APs got IPs. Rebooting the firewall also did not help. We then downgraded the firewall to 8.2(2)16 and all 6 APs immediately got IPs. Is there a bug related to DHCP relay on 8.4(4)?
I tried to look for, but there are no current bugs related to dhcp relay on ASA, I suggest you take captures and dhcp debugs to identify the cause for denial, only then any possiblity of a bug can be ruled out. Right now we dont even know whether it is the ASA or anyother device causing the issue, you need to first isolate that.
I upgraded three ASAs (1 5505 and two 5510) to 8.4(4)3 and on all three ASAs which were providing DHCP services to connected networks stopped working. Users could not get DHCP addresses from the ASAs running 188.8.131.52.
I did packet captures from the desktop, basically I see the DHCP requests leaving the desktop, but no replies from the ASA.
I downgraded the ASA to 8.4(4)1 and DHCP immediately starting working again.
I then upgraded back to 184.108.40.206. DHCP failed again. Downgraded the ASA to 220.127.116.11, then DHCP started working again.
Looks like a bug with ASA 18.104.22.168 and DHCP.