Active Directory COM Exception - An operations error occurred (0x80072020)

Question

I am getting an intermittent COM Exception \"An operations error occurred (0x80072020)\" (shown below) when I try and query Active Directory using the metho

Answer 1

Granted this is 2 years later, I ran into this and found that the following solved my issue:

using System.Web.Hosting;
...
...
// Code here runs as the logged on user

using (HostingEnvironment.Impersonate()) {
// This code runs as the application pool user
     DirectorySearcher searcher ...
}

reference

Answer 2

If you got a error code, "An operations error occurred (0x80072020)", it might mean "Access denied".

• Check your Web server whether or not in AD Domain
  • If not you have to put authentication into PrincipalContext.

Example (Something like this):

public bool foo(String username, String password) {
    string ADIPaddress = "[ipaddress]";
    ContextOptions options = ContextOptions.Negotiate;
    PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, AD_IPaddress, null, options, username, password);
    bool isAuthenticated = principalContext.ValidateCredentials(username, password, options);
    return isAuthenticated;
}

Reference

• C#網頁登入AD網域進行LDAP驗證