We have a mixed environment of Exchange 2010 and 2013, due mainly to this error, it does not prevent any use of outlook or its features we just know that our users will all have a fit seeing it upon start-up of outlook so we have not completed the migration of all the mailboxes until this is resolved.
This is only appearing When exchange cache mode is enabled on outlook 2013 we get the username and password prompt and then the following error
'There is a problem with the Proxy Server's security certificate. The name on the security certificate
is invalid or does not match the name of the target site servername
Outlook is unable to connect to the proxy server. (error code 10)'
clicking OK is the end of it, but its still a problem so we have not completed the migration of any more mailboxes other than us in IT
we are at a total loss at the moment as to why this issue is occurring, especially as with cached mode off it works perfectly with no prompt or error, could anyone point me in the correct direction to resolving this
Cheers
Nathan