We have had a Dynamics CRM 2011 site serving internally on our network on HTTP for c. 2 years. No Problems.
The site is hosted in a data center in london and access is (for the most part) from remote sites.
Recently purchased and installed an SSL Certificate from Go-Daddy, switched over the bindings to https within IIS.
Since doing this, once every few weeks our IIS server will randomly stop serving HTTPS traffic to remote sites (different subnets) for just a few minutes, after this time the issue resolves itself and the site can be browsed again.
Traffic continues to be served internally within the data center on HTTPS during this period.
We have a VPLS between sites and no firewall is affecting traffic.
Routing is manged correctly and there are no issues here.
HTTP continues to work from the same server to any client for the duration of the problem.
No packet loss or ping drops.
No events logged in any windows event log for the periods of time when it occurs.
I'm really struggling to know where to focus my investigation and was wondering if anybody had any suggestions?
I feel like its related to the SSL certificate, perhaps Revocation checking on the client?
Microsoft Dynamics CRM 2011 Front End Servers x 2 (CRM01 & CRM02)
Server 2008 R2, IIS 7.5.
Microsoft NLB (Load Balancing) Cluster Set Up between the two.
crm.mycompany.co.uk DNS entry points towards the NLB Cluster IP Address
Any thoughts would be greatly appreciated.