PI Coresight, Data Archive are in same domain but PI AF in different domain.
How will I connect PI Coresight to PI AF in this case.
My suggestion would be trusted domain or install a new AF server in the same domain and replicate the content either manually or create a tool that keeps them in sync.
All other work-arrounds that I can think of won't be user friendly.
As Andre mentions, the best way to communicate cross-domain between PI AF and other PI products is to set the domains up in a "trusted" configuration.
The reason for this is because PI AF security is entirely built on Windows Integrated Security, and if two domains are not trusted, Windows Integrated Security is not passed across the domain barriers. By trusting the domains, however, you are able to authenticate with domain accounts on each side. Your IT or Operations team should be able to provide more information on how this is done.
Please see our KB00354 which contains a more complete write-up on this topic: KB00354 - Supported Windows Security Configurations in Domains and Workgroups for the PI Data Archive
If trusting the domains is not an options, check out the section towards the bottom titled Other Supported Configurations, Untrusted Domain/Workgroup which will discuss, among other things, the Windows Credential Manager. This is a way of storing usernames/passwords client-side which can essentially force a credential handshake cross-domain. There's considerations to be aware of both in terms of security, as well as manageability (these are discussed in the article)
Retrieving data ...