I started my InterSystems journey in support and moved to sales engineering - what has remained consistent is that I love helping people.
First thing that comes to mind is disabling TLS 1.1 as that is deprecated. For TLS 1.3 (if that's required) you'll need to migrate to IRIS ( being on Cache 2017 probably has other security implications that would be remedied by upgrading at least to Cache latest.)
You might be able to find out more about this issue using ^REDEBUG as discussed in another post on the community, else support can probably help look into what the issue is. It's been a bit since I've worked on something like this myself.
The file spec is pretty straightforward so it is hard to guess what could be going wrong without actually looking at what's going on. I would suggest reaching out to support.
If you're looking for moving individual productions, guidance like the AI bot provided might be what you need. For larger migration style events I would suggest looking at the documented migration guide, from which you can pick and choose the settings / steps that pertain to what you are looking to sync.