I'm using the REST API to make the following SOQL query:

https://<instance_name>.salesforce.com/services/data/v29.0/queryAll?q=SELECT+WhoId,+WhatId,+Account.Name,+Who.Name,+What.Name,+Id,+AccountId+FROM+Task+WHERE+Id+IN+('<TASK_ID_1>','<TASK_ID_2>',...,'<TASK_ID_22>')

Where <TASK_ID_1> ... <TASK_ID_22> are 22 different Task Ids. This usually works fine but for one specific customer the response from the query is just the string "No target url" (without the quotes, just the string, without JSON formatting).

The same query works just fine for many other customers, and other queries for this specific customer work as well. What may be the cause for this behavior?

I'm using the REST API to make the following SOQL query:

https://<instance_name>.salesforce.com/services/data/v29.0/queryAll?q=SELECT+WhoId,+WhatId,+Account.Name,+Who.Name,+What.Name,+Id,+AccountId+FROM+Task+WHERE+Id+IN+('<TASK_ID_1>','<TASK_ID_2>',...,'<TASK_ID_22>')

Where <TASK_ID_1> ... <TASK_ID_22> are 22 different Task Ids. This usually works fine but for one specific customer the response from the query is just the string "No target url" (without the quotes, just the string, without JSON formatting).

The same query works just fine for many other customers, and other queries for this specific customer work as well. What may be the cause for this behavior?