We saw this syslog %FTD-ha-3-210005: LU allocate connection failed for TCP connection from inside:A.B.C.D/xxxx to outside:173.243.132.167/514" every time.
I verify that this public IP is used for Fortinet. And the A.B.C.D Ip is our Firewall Fortinet.
We have that behavior only with this conection.
I see some bugs afected to the ASA Version 9.12.(2) 115 in the TFD 6.4.0.9 version.
The memory looks fine, it is at 66% free
Did you have similar behavior?
Thanks
DR