We have an Exchange 2010/2007 environment. Out internet facing site has the 2010 CAS/HUB server which answers to https://owa.domain.com/owa and a 2010 CAS/HUB/Mailbox server as well as a legacy 2007 CAS/HUB and CAS/HUB/Mailbox server in it. It works fine for all exchange servers (2010 and 2007) in that site.
Our other site (we'll call it site2) consists of a 2010 CAS/HUB/Mailbox server and a legacy 2007 CAS/HUB/Mailbox server. Basically, when an internal 2010 user tries to connect to the https://owa.domain.com/owa, it proxies to the server (site2-2010-exchange.domain.com/owa) but it appends /ping.owa to the end of the url. So instead of HTTPS://site2-2010-exchange.domain.com/owa, it returns https://site2-2010-exchange.domain.com/owa/ping.owa which gives a 404 error.
If I manually remove the ping.owa, it works fine. That is not a solution for us though. I need to know why it is doing this and correct it so when we move the rest of users to 2010, they won't have this issue. The current users on 2007 do not have this issue. It redirects to the https://site2-2007-server.domain.com/owa with no issue.
Anyone seen this before. Having trouble finding relevant articles regarding this online.