AstraSync user support is handled through the user forum at http://forum.astrasync.com/.
The forum has comprehensive FAQ and Error Messages sections. There is also a user area where you can view posts from others, and post about any problems you are having or enhancements you would like to see.
The forums are monitored by AstraSync support staff who will respond to your posts as soon as possible. To aid the speed of responses please try to post your questions in the most relevant section.
If you are an enterprise level customer you can request direct email support here.