Client for 32-bit Windows Administrator's Guide - Citrix Knowledge ...

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44 Client for 32-bit Windows Administrator’s Guide Go to Document CenterCommunicating with the Citrix XML ServiceCitrix XML Service, a component of MetaFrame Presentation Server, is installedby default on all servers running MetaFrame Presentation Server. The XMLService communicates published application information to Clients using HTTPprotocol and XML data. The XML Service also communicates publishedapplication information to servers running the Web Interface.For example, when a user launches a published application from ProgramNeighborhood, the Client sends a request for the application. The XML Serviceresponds with the address of a server on which the application is published.With the Web Interface, for example, a user connects to a Web page using a Webbrowser. The XML Service provides a list of available resources to the serverrunning the Web Interface. The server then displays the available resources on theuser’s personalized application Web page.For more information about the Citrix XML Service, see the MetaFramePresentation Server Administrator's Guide.Specifying the Network Protocol for ICA BrowsingAs described above, ICA browsing is a process that locates servers and publishedapplications in response to requests from a Client. Changing the network protocolsetting allows you to control the way the Client searches for servers runningMetaFrame Presentation Server and how it communicates with them.For step-by-step instructions about configuring the network protocol, see theProgram Neighborhood online help. For more information about using SSL tosecure client-to-server communication, see “Configuring and Enabling Clients forSSL and TLS” on page 86.This section discusses the TCP/IP+HTTP, SSL/TLS+HTTPS, and TCP/IPprotocols and their implementation in a server farm. For additional informationabout configuring server farms for ICA browsing, see the MetaFrame PresentationServer Administrator's Guide included in your MetaFrame Presentation Servermedia pack.Important SSL/TLS+HTTPS or TCP/IP+HTTP retrieves information only on aper-server farm basis. To retrieve information from more than one server farm, youmust configure server location settings for each application set. For custom ICAconnections, you must configure server location settings for each ICA connection.Do not place addresses from separate farms in the same server location list.
Go to Document Center Chapter 4 Configuring Program Neighborhood 45Using TCP/IP+HTTP for ICA BrowsingProgram Neighborhood uses TCP/IP+HTTP as the default network protocol. TheClient uses the HTTP protocol to search for servers running MetaFramePresentation Server. Select this protocol when Clients connect over the Internet orthrough a firewall or proxy server.Using the TCP/IP+HTTP protocol for ICA browsing provides the followingadvantages for most server farms:• TCP/IP+HTTP uses XML data encapsulated in HTTP packets, that the Clientsends to port 80 by default. Most firewalls are configured so port 80 is open forHTTP communication.• TCP/IP+HTTP does not use UDP (User Datagram Protocol) or broadcasts tolocate servers in the server farm.• Routers pass TCP/IP packets between subnets, which allows Clients to locateservers that are not on the same subnet.By default, if no server is specified, the Client attempts to resolve the name “ica” toan IP address. This is indicated by the virtual server location “ica” in the AddressList box. This feature allows the Domain Name System (DNS) or WindowsInternet Naming Service (WINS) administrator to configure a host record that maps“ica” to a valid server IP address that can service XML requests from Clients.You must map a server running MetaFrame Presentation Server to the default nameof “ica” on your network or you must specify at least one IP address in ProgramNeighborhood.Tip You can configure the DNS server for the Clients to use round-robin DNS tomap the name “ica” to a set of servers that can service the XML requests. Use thisapproach to avoid individually configuring server location addresses on your clientdevices.You can specify servers to contact for ICA browsing by entering IP addresses orDNS names of servers running MetaFrame Presentation Server in the Address Listbox in Program Neighborhood. You can define up to three groups of servers: aprimary and two backups. Each group can contain from one to five servers. Whenyou specify a server group for your Client, the Client attempts to contact all theservers within that group simultaneously and the first server to respond is the one towhich you connect.To locate the Citrix XML Service, the Client makes an HTTP connection to port 80on the server running MetaFrame Presentation Server. If the user is launching apublished application, for example, Citrix XML Service sends to the Client theaddress of a server running MetaFrame Presentation Server that has the applicationpublished.
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