IIS 7 and Above
Crystal Reports Login Fails on ExportToDisk
Re: Crystal Reports Login Fails on ExportToDisk
Nov 05, 2018 05:37 AM|Brando Zhang|LINK
Since the SDK works in 2016 it will be using the OLD DB access method, I suggest you could change the Crystal report to use an OLE DB datasource. Then it may work well.
Besides, this issue is related with the Crystal Reports not IIS, I suggest you could try to post this issue on the Crystal report forum.