Error obtaining group names. An operations error occurred.

The “Error obtaining group names. An operations error occurred.” exception tends to occur when using Active Directory :

The probably fix for this would be get the group names by explicitly passing the security context.

Here is some sample code-

public string GetGroups(string domainName, string userName, string password) 

        { 

            String domainAndUsername = domainName + @"\" + userName; 

            DirectoryEntry entry = new DirectoryEntry(_path, domainAndUsername, password); 

            StringBuilder groupNames = new StringBuilder(); 

            try 

            {    //Bind to the native AdsObject to force authentication.            

                Object obj = entry.NativeObject; 

                DirectorySearcher search = new DirectorySearcher(entry); 

                search.Filter = "(SAMAccountName=" + userName + ")"; 

                search.PropertiesToLoad.Add("memberOf"); 

                SearchResult result = search.FindOne();

                int propertyCount = result.Properties["memberOf"].Count; 

                String dn; 

                int equalsIndex, commaIndex; 

                for (int propertyCounter = 0; propertyCounter < propertyCount; propertyCounter++) 

                { 

                    dn = (String)result.Properties["memberOf"][propertyCounter]; 

                    equalsIndex = dn.IndexOf("=", 1); 

                    commaIndex = dn.IndexOf(",", 1); 

                    if (-1 == equalsIndex) 

                    { 

                        return null; 

                    } 

                    groupNames.Append(dn.Substring((equalsIndex + 1), (commaIndex - equalsIndex) - 1)); 

                    groupNames.Append("|"); 

                } 

            } 

            catch (Exception ex) 

            { 

                throw new Exception("Error authenticating user. " + ex.Message); 

            } 

            return groupNames.ToString(); 

        }

 

Hope this helps

Cheers