1. How to tell if polling has stopped.
Check both sides of polling companies under <CCDIR>/<COMPANY>/<POLLING LOC>/send/
There should be only the last few zip file(s) generated since files were exchanged. You can confirm with the file in the above directory called "lastsend"
2. What to do if polling has stopped.
Before changing anything, make sure you have run "umask 0". This ensures all your files are world writable and eliminates permissions as a possible cause.
The first thing to do if polling has stopped, is to run comaad (on both sides) and set the polling state back to 0. 99% of the time this will fix the issue.
3. How to resend a zip file.
If a zip file needs to be re-sent (incomplete zip file), normally the polling will be stopped. In this case you can do procedure 2 above (set the polling state back to 0) and polling should re-send the file automatically. If this still fails, go to the receive side, delete the corrupt file, set polling state (on both sides) back to 0 and try again.