We have had similar reports in the past and we generally recommend that the URL limit be set to 2000 characters. There is no specific standard on the maximum length of URLs or the querystring. Since all browsers allow at least 2000 characters, we have set this to be the maximum. If you are using a shared hosting or some other application (e.g. 3rd party firewall) is blocking the long URLs, we offer the following workaround:
| function setUrlLength(editor)
| editor.get_dialogOpener()._dialogUrlLengthLimit = 1000;
|<telerik:RadEditor ID="RadEditor1" runat="Server" OnClientLoad="setUrlLength" .../>
You need to add the following code to your page. It runs when the editor is loaded in the browser and sets the maximum URL length for the dialogs (in this case 1000 characters):
It is not recommended to use it because this is not part of the public editor API. This means that we might change the way it works in a future version of the editor, which means problems if you decide to upgrade. You will need to test that this code works after each update. We will consider adding it to the public editor API for the next RadControls release so it can be included in the support resources (documentation).
the Telerik team