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I am attempting to use PrincipalContext for a webservice that I am developing. I have already been using forms authentication on the web server in a different application and it works fine. The error that I am recieving is : System.DirectoryServices.AccountManagement.PrincipalServerDownException: The server could not be contacted. ---> System.DirectoryServices.Protocols.LdapException: The LDAP server is unavailable. at System.DirectoryServices.Protocols.LdapConnection.Connect() at System.DirectoryServices.Protocols.LdapConnection.SendRequestHelper(DirectoryRequest request, Int32& messageID) at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout) at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request) at System.DirectoryServices.AccountManagement.PrincipalContext.ReadServerConfig(String serverName, ServerProperties& properties) --- End of inner exception stack trace --- at System.DirectoryServices.AccountManagement.PrincipalContext.ReadServerConfig(String serverName, ServerProperties& properties) at System.DirectoryServices.AccountManagement.PrincipalContext.DoServerVerifyAndPropRetrieval() at System.DirectoryServices.AccountManagement.PrincipalContext..ctor(ContextType contextType, String name, String container, ContextOptions options, String userName, String password) at System.DirectoryServices.AccountManagement.PrincipalContext..ctor(ContextType contextType, String name, String container, String userName, String password) at webService.Service1.ValidUser(String sUserName) in E:\Development\CSharpApps\Desktop\OrgChart\webService\Service1.asmx.cs:line 158 Our webserver is in the DMZ and accesses the domain through the firewall. I am using the port information etc as below for an example. This works using the ip from my development box, however it is inside the firewall.

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