Error message when i try to connect to SharePoint Store, when i click on Sharepoint Store in the site its throwing me below error message,

Question

Error message "Sorry, we can't seem to connect to the SharePoint Store. Try again in a bit."
when i try to connect to SharePoint Store, when i click on Sharepoint Store in the site its throwing me above error message,
In the log it shows
Request to office.com with the following URL:https://hostname/sites/appcatalog/config15 caused an exception. 
System.Net.WebException: 
Request to office.com should be routed with url URL:http://office.microsoft.com/client/15/commerce/query  but 
 request to office.com is sent with following URL:https://hostname/sites/appcatalog/config15
and the Response from office.com was null or its HTTP status code was not 'OK'. Actual status code: 'InternalServerError'
An exception was thrown while running task 'GetOfficeMarkets'. Microsoft.SharePoint.SPException: Sorry, we can't seem to connect to the SharePoint Store. Try again in a bit.  
Feature "Apps that require accessible internet facing endpoints" activated in the Central Admin  .
kindly help on this issue

Answer 1

Hi,
For a better troubleshooting, I suggest to do as follows:
1. Check whether the App management shared service add to the Farm, and we need to configure the Subscriptions setting service also.
2. SharePoint Server IP Address excluded from the Websense.
3. Restart the server.
4. Please check as the link below.
http://www.naumanahmed.com/2012/07/sharepoint-2013-app-management-service.html
More information:
http://msdn.microsoft.com/en-us/library/fp179919.aspx
Best Regards
Dennis Guo
TechNet Community Support