Problem with DHCP and 2 firewalls

Hi.

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I am currently working with a firewall migration where i need both the new pfSense and the current Cisco ASA to keep running meanwhile. This means that our DHCP server is behind the ASA but the clients behind the new pfSense needs to get the IP from the said DHCP server.

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I have currently setup DHCP Relay on the pfSense and also tried enabling it on the Cisco ASA without any success. We built a transport network between the 2 firewalls and we can ping between new clients and old DHCP server, but can't seem to get an IP-address. When doing ipconfig /renew we just don't get any response from the DHCP server.

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I hope you can help.

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Best regards

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EDIT: I should mention that for testing purposes everything is opened on the firewall and also tried with specific rules to open for UDP port 67-68.