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

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46 Client for 32-bit Windows Administrator’s Guide Go to Document CenterUsing SSL/TLS+HTTPS for ICA BrowsingWith SSL/TLS+HTTPS as the network protocol, the Client uses the HTTPSprotocol to search for a list of servers running MetaFrame Presentation Server. Theclient communicates with the server using ICA with SSL/TLS. SSL/TLS+HTTPSprovides strong encryption of ICA traffic and server authentication. Select thisoption when using SSL or TLS communication over the Internet or through afirewall or proxy server.Important By default, IIS and SSL/TLS for ICA connections are set to port 443. Ifyour users are configured to use port 443 for IIS, you must specify another portnumber for SSL Relay after you install the certificate for SSL/TLS.If you select SSL/TLS+HTTPS as the network protocol, you must enter the fullyqualified domain name of the server hosting the digital certificate.Note The TCP/IP+HTTP and SSL/TLS+HTTPS protocols can be used only withcompatible servers running MetaFrame Presentation Server. See the MetaFramePresentation Server Administrator's Guide for Windows or UNIX for informationabout configuring the server running MetaFrame Presentation Server to use SSL/TLS.Using TCP/IP for ICA BrowsingWith TCP/IP as the network protocol, Clients send UDP broadcasts to the ICAbrowser service on port 1604 to locate published applications and servers runningMetaFrame Presentation Server. Select this option if all servers running MetaFramePresentation Server and all Clients are located on the same network.With TCP/IP as the network protocol, the default setting for server location is(Auto-Locate). The auto-locate function works as follows:1. The Client broadcasts a “Get Nearest MetaFrame server” packet. The firstserver running MetaFrame Presentation Server to respond returns the address ofthe master ICA browser, which is used in the next step.2. The Client sends a request for the server and published application lists to themaster ICA browser.3. The master ICA browser responds with a list of all servers on the networkrunning MetaFrame Presentation Server and a list of all published applications.To eliminate broadcasts on your network, or if your network configuration usesrouters or gateways, you can set a specific server address for the server thatfunctions as the master browser.
Go to Document Center Chapter 4 Configuring Program Neighborhood 47Important By default, server farms operating in native mode do not respond toClients that use UDP broadcasts for ICA browsing. Therefore, if Clients areconfigured to use TCP/IP and to auto-locate servers, they will fail to locate serversor published applications in a server farm running MetaFrame XP or later.Because UDP broadcast packets do not traverse subnets, using broadcasts for ICAbrowsing works only if a server that responds to broadcasts is on the same subnet asthe Client. When the Client locates a server, it communicates using directed (notbroadcast) UDP to port 1604.Because of broadcast limitations, you might prefer to enter one or more IPaddresses or DNS names of servers running MetaFrame Presentation Server in theAddress List box in Program Neighborhood. You must do this if the Client is noton the same subnet as a data collector.Improving Performance Over Low-Bandwidth ConnectionsIf you are using a low-bandwidth connection, such as a modem, you can make anumber of changes to your client configuration and the way you use the Client toimprove performance.In addition, Citrix recommends that you use the latest version of MetaFramePresentation Server and its Clients. Citrix continually enhances and improvesperformance with each release. Many performance features require the latest clientand server software to function.Changing Your Client ConfigurationOn devices with limited processing power, or in circumstances where only limitedbandwidth is available, there is a trade-off between performance and functionality.The Client provides both user and administrator with the ability to choose anacceptable mixture of rich functionality and interactive performance. Making oneor more of these changes can reduce the bandwidth your connection requires andimprove performance:• Enable data compression. Compression reduces the size of the data that istransferred over the ICA connection. Enable compression and specify themaximum compression parameter.• Enable the bitmap cache. Bitmap caching stores commonly used bitmaps(images) locally on your client so that they do not have to be transferred overthe ICA connection every time they are needed.
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