Error Setting up Incoming Email Subtab for Flexible Approval - if Exchange Server account contains special character

[#1]

Description

This KB article will describe a product issue when the user tries to configure 'Flexible Approval'. An incoming Exchange Server account need be setup.  However current App Portal 2019 R1 doesn't accept password if contains any following special character '",<,>,*,%,&,:,\,?   as part of the password, there can cause the issue.

Replication Scenario

The error message can be found under 'EmailServices.log'

<![LOG[Error during async postback. A potentially dangerous Request.Form value was detected from the client (ctl00$cph1$MailParserMailboxPassword="r4pV<nJb3RgqX2x"). at    at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection)
   at System.Web.HttpValueCollection.EnsureKeyValidated(String key)
   at System.Web.HttpValueCollection.Get(String name)
   at System.Web.UI.WebControls.TextBox.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)]LOG]!><time="13:55:51.000+240" date="4-15-2020" component="ScriptManager1_AsyncPostBackError" context="" type="1" thread="4" file="Website">
<![LOG[Unhandled Exception https://xxxxxxxx/esd/admin/Settings_Email.aspx A potentially dangerous Request.Form value was detected from the client (ctl00$cph1$MailParserMailboxPassword="r4pV<nJb3RgqX2x").    at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection)
   at System.Web.HttpValueCollection.EnsureKeyValidated(String key)
   at System.Web.HttpValueCollection.Get(String name)
   at System.Web.UI.WebControls.TextBox.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)]LOG]!><time="13:55:51.000+240" date="4-15-2020" component="Applicati

Workaround

Try to avoid using above mentioned character in your account. (Underscore '_' and 'Exclamation mark '!' are supported)

Resolution

The bug will be fixed in future release (The time reported from version 2019 R1)