Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
* What led up to the situation?
I upgraded my distritution from debian jessie to stretch.
Under jessie i didnt had this problem.
* What exactly did you do (or not do) that was effective (or
ineffective)?
I have a custom filter with approx. 1300 entries for blocking specific file types
which are used by cryptolockers. I use this filter to protect my samba shares.
After the upgrade, fail2ban failed to start with an timeout error.