We have recently encountered a problem in which an application running on our Windows Server 2012 R2 Azure VM is getting periodic failures to an external address.
This application is a 3rd-party application, and has not been modified since it was initially installed about 5 months ago. Looking through the Event Viewer logs on the Azure VM it appears the application would fail to connect maybe once a day prior to Friday, which doesn't seem too abnormal. On Friday it began failing much more frequently, instead of once a day it is now more like once a minute.
We have communicated with the application vendor, and for the failures they are not seeing any connection attempts on their side, so it appears the connection attempt is dropping somewhere between our Azure VM and their site.
As a test we installed this application on a system outside of the Azure environment and it didn't have any trouble communicating with the external address.
Any help diagnosing where this problem may be occurring or suggestions on where to begin looking is greatly appreciated.
Thanks!
