This indicates an attack attempt against a Denial of Service vulnerability in IBM SolidDB Server.
The vulnerability is caused by an error when the vulnerable software handles a malicious error code value. It allows a remote attacker to cause a DoS via sending a crafted request.
IBM SolidDB Server 220.127.116.11
IBM SolidDB Server 18.104.22.168
Denial of Service.
Apply the patch available from the vendor.