To know how ConnectALL handles the Log4j 2 vulnerability issue, please read the article here.

How to resolve the Jira sync error when Jira error states a specific field not available in the screen?

Please check that the corresponding field is available on the relevant Create and Edit screens in Jira. It is mandatory that the field that is mapped in ConnectALL for synchronization is available as part of the Create and Edit screens in JIRA to create or modify via REST calls.