Intermittent issues logging into StoreFront internally and also externally through the Netscaler Gateway where users would get a “Cannot Complete your Request Message”.
If you have already looked at the Citrix articles below and those solutions did not correct your issue, take a look at extending the timeout for the ReceiverWeb.
Login to your StoreFront Server and navigate to C:\inetpub\wwwroot\Citrix\StoreWeb
Open the Web.config file with Notepad or another text editor like Notepad++.
Locate the Communication attempts line and change your timeout value to 2:00 minutes.
If users are still getting a cannot complete your request message you can increase the timeout value.
<communication attempts=”2″ timeout=”00:02:00″>
In our situation, we had several XenApp Farms and 1 XenDesktop Site configured on the StoreFront Store. When one of the XML brokers failed or was responding slower, users logging in internally or externally would occasionally get “Cannot Complete your Request”. After increasing this value I haven’t seen this issue occur again..