The VMs are not assigned ip address by dhcp server.

I have the exact same problem...I am new to Proxmox but it seems strange - especially since I managed to get it working at first, but not anymore !
 
Has anyone resolved this problem? I am having the same problem. I have a local Debian DHCP server on the same subnet as the proxmox host. The KVM DHCP request reaches my DHCP server which attempts a response, which never gets to the KVM. I have tried turning off all the firewalls and have deleted the NIC on the KVM and re-added it. A new Debian install in KVM still can't get the IP address. See screenshots below documenting my setup and what is happening.

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Just tried Debian 12.5 and setup firewall to accept UDP destination 255.255.255.255 ports 67,68. Same results.
 
Finally figured it out. I was running proxmox second level under ESXI host 6.0. I installed same version of proxmox on bare metal and it works fine with the exact same settings.
 
So i had this issue, and after reading sysmg's obsevation i figured it out, vmware does not allow chaning mac addresses så you need to go into security and allow this on the vswitch.
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