Hello
Images in emails in Outlook have suddenly stopped working if the link is HTTPS and instead show the red X when using Outlook internally.
Software is:
Microsoft Exchange 2013 SP1 running on a Windows Server 2012 R2 server.
Outlook is 2013 SP1
Externally clients that use Outlook Anywhere can view images correctly and it is only internal clients where it has stopped working.
Normally machines don't use the TMG server as the gateway or as a proxy in IE but I have tried both and it makes no difference.
The error that seems to be getting logged in TMG is:
Closed Connection Log type: Firewall service Status: A connection was abortively closed after one of the peers sent an RST packet. Rule: Allow Web Access for All Users Source: Internal (192.168.1.99:55069) Destination: External (www2.twitter.jp 199.59.149.201:443) Protocol: HTTPS
This is just the last email I clicked on but all the rest are the same. If the image is just http then it loads. I have checked the email server and can browse the internet fine and view images over HTTPS. I can also browse images over HTTPS on the client with TMG as the Gateway so I'm not sure what it could be.
HTTPS inspection is disabled as well.
Thanks
Robin
Robin Wilson