We are using a MS IIS FTP server, which has files with last modification timestamp in the hour up to where DST is switch. eg 01:03 GTM+1
After 02:00 the server switch to DST, but an error with MS FTP shows all files with new timestamps as DST. So file which was original 01:03 GMT+1 are now listed as 02:03. This produce a NPE in the ListFTP Process: ListFTP[id=0179107b-f93a-12c7-8a5e-52491c478f60] failed to process session due to null; Processor Administratively Yielded for 1 sec: java.lang.NullPointerException I have created a JIRA: https://issues.apache.org/jira/browse/NIFI-9837 kind regards Jens M. Kofoed