userprincipal.findbyidentity an operations error occurred

Okay so, I have been given the responsibility to migrate a website with multiple applications to another server. That migration went well (all applications working). However, the performance of that new server was sub par (whole other story). We decided to migrate it again. This time everything is working very well-- except one application. It worked just fine on the first and second IIS servers, but is refusing to cooperate this time around.

I've mirrored all the config settings that I could find from the working server: windows authentication enabled: check Impersonation disabled: check applicationpool settings match: check

I just don't know what I'm missing; why would it work on one server, but not the other.

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An operations error occurred.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Runtime.InteropServices.COMException: An operations error occurred.

Source Error:

Line 9:          Dim myUsername As String = Right(User.Identity.Name, Len(User.Identity.Name) - InStr(User.Identity.Name, "\"))
Line 10:         Dim ctx = New PrincipalContext(ContextType.Domain)
Line 11:         Dim myUser = UserPrincipal.FindByIdentity(ctx, myUsername)
Line 12:         hfValid.Value = "false"
Line 13:         For Each gp As GroupPrincipal In myUser.GetAuthorizationGroups

Source File: D:\mghnet1\isOnCall\Default.aspx.vb Line: 11

COMException (0x80072020): An operations error occurred

System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail) +378142
System.DirectoryServices.DirectoryEntry.Bind() +36
System.DirectoryServices.DirectoryEntry.get_AdsObject() +31
System.DirectoryServices.PropertyValueCollection.PopulateList() +26
System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName) +49
System.DirectoryServices.PropertyCollection.get_Item(String propertyName) +150
System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInitNoContainer() +1114
System.DirectoryServices.AccountManagement.PrincipalContext.DoDomainInit() +37
System.DirectoryServices.AccountManagement.PrincipalContext.Initialize() +112
System.DirectoryServices.AccountManagement.PrincipalContext.get_QueryCtx() +31
System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithTypeHelper(PrincipalContext context, Type principalType, Nullable`1 identityType, String identityValue, DateTime refDate) +14
System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithType(PrincipalContext context, Type principalType, String identityValue) +73
System.DirectoryServices.AccountManagement.UserPrincipal.FindByIdentity(PrincipalContext context, String identityValue) +28
_Default.Page_Load(Object sender, EventArgs e) in D:\mghnet1\isOnCall\Default.aspx.vb:11
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

Version Information: Microsoft .NET Framework Version:2.0.50727.5466; ASP.NET Version:2.0.50727.5456

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Please help, none of the other forum posts I've found have posted solutions that work for me.