Hello, everyone.
I am fairly new to the world of SQL server, so I apologize for any newbie errors in my question. I am also not sure if this is an SQL, IIS, or Windows Server issue.
The Environment:
One physical server running Hyper-V
Physical server is acting as domain controller, Hyper-v host and DNS server
All servers are part of the same domain.
Server version is 2012 R2 in all instances.
SQL version is 2014 in all instances.
.NET version is 4.5
All software is fully updated.
The Virtual Servers:
SQL Server
IIS Web Server
Test Server with IIS and SQL
The Problem:
The IIS Web Server cannot connect to the SQL Server without the application pool crashing.
The SQL Server logs show the login from the web server was successful.
The web server’s event logs show a “fatal communication error with the Windows Process Activation service.”
Other Facts:
When the IIS server and SQL server are on the same “machine” (the test server mentioned above) there are no issues at all – everything runs normally.
The website code is identical in both cases, as is the SQL configuration, including users and permissions.
If the connection on the test (previously working) is changed to connect to the standalone SQL server, the problem triggers, the app pool crashes, and the error message in the event log is the same as in the standalone web server.
For testing, the firewalls have been turned off on all servers and it makes no difference.
Windows authentication and SQL authentication both have the same results.
Using a standalone UDL file, a connection CAN be made to the SQL server from any other server, including the IIS Web Server where the app. pool crashes.
I realize I am no providing actual examples, but based on the information above, I am hoping to get some direction on where to look for a problem. Most of the information I have found on the error deals with Sharepoint, which is not a variable in my case.
Since the firewalls have been turned off, the problem only happens when attempting to connect to SQL from an outside server, and only happens through IIS, I am at a loss on what else to check.
Thank you in advance for any relevant advice.