When reading the word, Commerce, pops out at me and I am wondering if you are using the Commerce Provider or if this is when indexing the CMS.
No, this is CMS 6 so we are handling indexing product information our selves.
Seems like a network issue. Can you try to switch network in any way and see how it affects the issue (Semi stupid question but maybe you have the possibility to run it locally or on some hosting environment on a different network)? Our network monitoring tools don't show any issues.
During indexing of data we get the following error: