An error occurred while trying to connect to a Web service, when InfoPath web enabled form loads.

Question

Hi Everyone,
I am getting an error message: An error occurred while trying to connect to a web service, when my InfoPath form tries to load.  The last few days, it only spits this error message in the morning and around 12pm-1pm it resolves itself and the form loads
fine the rest of the day, oddly enough. 
A few things about my form:
1). It is web enabled
2). The form submits to a form library on the SP server
3). I use the UserProfileService data connection in the form to auto-populate a few fields
4). I use a udcx file with correct language stored in the root of the site collection in the data connection library
5). The form has been working fine until a few days ago
I noticed while in Central Administration, that the User Profile Service Synchronization is Stopped.  Not sure if this is causing some or all of the problem. If I need to start it I will need to contact my farm administrator to do this, since I do not
have the service account information.
Also, I looked thru the log files on the SharePoint server and found the following by searching for the Correlation ID shown when the error comes up, I won't put in everything just the important messages.
Schema file was already loaded: BuiltInActiveXControls.xsd
FormServer Partial Trust - Proxy operation invoked in the SHIM process.
FormServer Partial Trust - Invoking proxy operation for Web service adapter failed with exception Operation is not valid due to the current state of the object. for Url=https://<SP URL>/_vti_bin/UserProfileService.asmx
Data adapter failed during OnLoad: The custom code in the form cannot be run. This functionality may be deactivated on the server. For more information, contact the server farm administrator.
The following query failed: GetUserProfileByName (User: , Form Name: Expense Report, IP: , Connection Target: <SP URL>/Data Connections/GetUserProfileByName.udcx, Request: , Form ID: urn:schemas-microsoft-com:office:infopath:Expense-Report:-myXSD-2014-04-11T21-06-32
Type: DataAdapterException, Exception Message: The custom code in the form cannot be run. This functionality may be deactivated on the server.

Answer 1

Hi B.,
You are on the right track. I recommend that you first get the User Profile Synchronization Service started because that itself could be the root cause of the issue.
If that doesn't fix it then focus your attention on the GetUserprofileByName data connection. I always use my secure store ID for this connection. I add the ID by editing the udcx file and then publishing it again.
Hope this helps.
Daniel Christian (MCTS)