SOLVED PXE-E55: ProxyDHCP service did not reply to request on port 4011

[MJ-Tech]

Apologies if my question was answered already in some other way. Request your assistance to fix the PXE boot issue please,
Server :
Primary server has below roles,
DHCP [ Address pool start IP address is, xx.xx.100.71 and End IP address is, xx.xx.101.240]
AD
IP : xx.xx.100.2
Secondary server has below roles:

DHCP [ Same as primary]

SCCM Server has below roles:
IP: xx.xx.100.23
WDS : Just installed but not configured (Note: instead , enabled Enable a PXE responder without windows deployment service option in Distribution point]
SCCM version 2103

PXE Network boot testing:

Scenario 1: Physical Machine: [ Network Legacy PXE Boot]
it is communicating properly to the primary server and assigning IP from DHCP server "xx.xx.101.xx" however at the end of the screen - receiving an error: PXE-E55: ProxyDHCP service did not reply to request on port 4011.

Scenario 2: Created hyper-V on SCCM server. enabled Legacy network boot. same error.

Could you please check and let me know how to troubleshoot and fix the issue please.

 

[MJ-Tech]

Looks like Antivirus software blocks a few ports in the firewall. For testing purposes, disabled the firewall and reran the PXE, working as expected.