502 Web error when Exporting ALL products

Here is a basic description of my configuration:
Server 2016 Core as a Host OS
Server 2016 Core under MS Hyper-V running nopCommerce (Multiple for difference purposes)
nopCommerce version is 3.9
I re-direct incoming traffic based on HTTP_HOST Headers to the Proper VM using URL Rewrite rules in IIS on the HOST OS.

Here is my issue.  When I try to Export to Excel (All Found) Items I get a "502 - Web server received an invalid response while acting as a gateway or proxy server."

I am assuming that the issue is a timeout issue.  If so where would I tell nopCommerce to wait longer before timing out?

Thanks in advance.

For anyone that runs into this scenario in the future here is answer

I went into the Server farm in my IIS console for the site in question.
Selected the Proxy
Greatly increased the Timeout.

I had to increase it to 600 seconds (I tried 300 but it still timed out).

cableguyusa wrote:

Thanks for the suggestion above worked for me, here are the details to change the timeout settings for IIS:

For IIS 7.0 / IIS 7.5 :
1.On the Web server, click Start, point to Control Panel, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
2.Expand the local computer node, expand Web Sites, right-click the appropriate Web site, point to Manage Web Site, click Advanced Settings.
3.In the Advanced Settings window, expand Connection Limits, change the value in the Connection time-out field, and then click OK.