Redirects, page unavailable, and Office 365

I think you want that user who previously requested a local sharepoint (host site.abccompany.com) must be redirected to ADFS server (sso.abccompany.com) to authenticate before being redirected to office365 sharepoint (abccompany.sharepoint.com)...

The easiest solution is to redirect requests https://site.abccompany.com/* to https://abccompany.sharepoint.com. it will have one more redirect (transparent for client)

to monitor sharepoint availability, you must create a pool with sharepoint members and use the following irule:

when HTTP_REQUEST { switch [HTTP::host] { "site.abccompany.com" { if { [active_members "Sharepoint_pool"] == 0 } { HTTP::redirect "https://down.abccompany.com" return } else { HTTP::redirect "https://abccompany.sharepoint.com[HTTP::uri]" } } "sso.abccompany.com" { pool ADFS_pool } default {} } }