ACSE | Save Editor for the Animal Crossing main series games | Editor library

I've tried to reduce this post as much as possible without leaving out information TL;DR included at bottom.

I have inherited a script that, in short

• checks 2 folders on server A for images and text files
• copies the text files to a destination folder on Server B
• copies the image files to a image destination folder on Server B
• archives these files on Server A
• deletes any files older than 5 days on Server A

here is said script

We are attempting to use WSO2 IS and Apache+mod-auth-mellon to do single sign-on among different Apaches.

This is regarding getting the SSO part working among multiple Apache instances:

I got a 1st Apache+mod-auth-mellon working with WSO2 IS. On the WSO2 Admin, I added an Identity provider and a Service provider.

After getting login working with the 1st Apache instance, I stood up a 2nd Apache (+mod_auth_mellon), and added a 2nd Service Provider, but I found that, in order to get the login into that 2nd Apache instance working, I had to add an additional ACS URL pointing to the 2nd Apache in the 1st Service Provider (in the WSO2 IS Admin) and vice-versa.

I think that the ACS URL that I had to add was the one ending in "postResponse".

Is this (having to add these "cross" ACSes to multiple Service Providers) a "normal" requirement with SAML-based SSO? Or is it something specific with mod_auth_mellon and WSO2 IS?

Thanks, Jim