We are having some issues with trying to set up an http post event. Everything seemed to work fine before we converted to DNN 5 using a web farm.

We have tried to send admin results, and don't get anything.

Error from error log:

AssemblyVersion: 5.1.4
PortalID: 4
PortalName: Allsup.com
UserID: 28
UserName: kellyw
ActiveTabID: 315
ActiveTabName: Contact Us
RawURL: /about-us/contact-us.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: https://www.allsup.com/about-us/contact-us.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: a0fe56e2-fdf3-4882-b0bd-9d68610d9c5e
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DataSprings.Modules.DynamicForms.DynamicForms.ProcessEvents
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DataSprings.Modules.DynamicForms.DynamicForms.ProcessEvents(Boolean blnRedirectOnly, Boolean blnPaymentGateway, String strPaymentStatus, String strResponseID, Int32 intPaymentUserID) at DataSprings.Modules.DynamicForms.DynamicForms.SubmitForm(Boolean ProcessPaymentNotification, String strResponseID) at DataSprings.Modules.DynamicForms.DynamicForms.imgSave_Click(Object sender, ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: HQ-VWEBHEAD02

It turns out this particular problem was the same problem I had ran into about a year ago but hadn't forgotten about so when we got our new web server setup it happened again.  The problem comes down to DNS (I believe).  We had to add a hosts record on the web server for our domain name to point back to itself.  Otherwise it was trying to route out to our external address, but was already on the internal network.  Some where along the way that wasn't working.  I don't fully understand why, but now that adding the hosts records fixed that issue.