DHCP Pool says no IP Addresses are available

[Anndy07099]

Hi, I was working with DHCP on my project, it has 3 simulation buildings which the first building, the DHCP is working just fine, but in the other buildings, some PC can grab an IP from the DHCP pool but some can't. The PC's already have a VLAN and they are working fine. When I went to the simulation mode, the PC sends the request to the DHCP server, receive it and then the DHCP server drops the packet saying "The DHCP pool does not have any more available IP addresses". I also checked the DHCP pool 

I attached a picture of the message below. Can someone help me out with this? Thank you!

[Flavio Miranda]

Attach the .pkt file zipped. If devices has password, dont forget to inform.

[paul driver]

Hello
As this is a lab (most probably Packet tracer) it could be anything, That simulation software doesn't provide any confidence if an actual issue exists or its just buggy software. and without looking into the PT file its hard to evaluate.

In a real environment given your explanation. I would tend to think towards a feature called dhcp conflict logging which is exhausting the dhcp pools

This is a feature when enabled on the rtr will ping its intended ip allocation address to be sure it isn't already active,
if it receives a response it will not allocate that ip address however it will also log this ip address as not the be used/allocated as such it will become unavailable

sh ip dhcp conflicts

if you cleared this dhcp conflict log buffer then dhcp allocation will be refreshed.
clear ip dhcp conflicts

[Richard Burts]

conflict logging is an interesting possibility. I would also want to look at the possibility that the dhcp config includes some excluded addresses. And if it does include excluded addresses look at the possibility that most/all of the addresses in the pool have been excluded.