Connection timeout 4c0a6035

[abhiniveshjain]

I have following kind of setup.

PXE server config

CentOS 7.6
DellEMC R640

PXE client is VM running on top of QEMU/KVM on same server. I trying to do ipxe boot with rhcos (Red Hat Core OS). It is able to reach DHCP server and get the IP and next server details.

After this, it calls matchbox URL of my installer host (i.e. PXE server) by passing uuid and mac address. here is the log that I see on console
-------------------------------------------
Booting from ROM.
iPXE (PCI 00:3.0) starting execution...OK
iPXE initializing devices...OK

iPXE 1.0.0+ (4e85b27) --OPen source network boot firmware --
Features:

net0: mac address using rt18139 on 0000:00.03.0 (open)
Link: up, TX:0, TXE:0, RX:0, RXE:0
Configuring (net0 macaddress) .........ok
net0:10.x.x.214/255.255.255.0
next server: 10.x.x.200
filename: http://10.x.x.200:8080/boot.ipxe
http://10.x.x.200:8080/boot.ipxe..OK
boot.ipxe :104 bytes (scripts)
ipxe?uuid=xxxx&mac=macaddress&domain=&hostname=&serial=...................................Connection timed out (http://ipxe.org/4c0a6035)
Could not boot image: Connection timed out (http://ipxe.org/4c0a6035)

No more network devices
--------------------------------------------

while calling this URL, it fails with connection timeout but when I run chain command manually on iPXE prompt, it works just fine.

iPXE> chain http://10.x.x.200:8080/boot.ipxe

system boots just fine from here....

Please help in fixing this issue as I am struggling on this from several days now.

Thanks,
Abhi