I'm unable to access Exchange 2010 public folders from Exchange 2016 mailboxes in one of our sites.
I followed this article and 2 of the 3 sites are OK. 1 site is having the below problem. https://technet.microsoft.com/en-us/library/dn690134(v=exchg.150).aspx
When browsing public folders from Outlook within the problem site, I'm prompted to enter credentials and receive the following error message: "There is a problem with the proxy server's security certificate. The name on the certificate is invalid or does not match the name of the target site webmail.domain.com . Outlook is unable to connect to the proxy server. (Error code 0)"
Has anyone seen this before?