i'm puzzled

Hopefully, you did not install the tcpip.dll shipped with cron2.  The docs
say nothing about why it exists, but I can't imagine it's going to work
well with the current TCP/IP stack.

I recommend you try a different cron, if only to provide more evidence
that cron2 has a defect or install problem.

There's always

   http://www.warpcave.com/betas/cronrgf-2.0.8beta2-20190510-shl.zip

which never seems to fail for me.:-)

Steven