sdgtw probe stop working after ServiceNow disabled TLS 1.0 and 1.1 from production instance.
java_jre package version (on sdgtw probe) is old.
sdgtw 2.20 running with UIM 8.5
Upgrade UIM to the latest (as of now 9.2.0) which will bring newer version of java_jre package.
KB article 131029 is similar TLS 1.2 probe issue.