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Port number	The TCP/IP or UDP/IP port on the server. If you change the default, you are changing it for every settings file that uses the TCP/IP or UDP/IP connection.
Proxy port	The port used to connect to the proxy server, if you connect through a proxy server. The default value of 1080 is the normal proxy server port.
Proxy IP address	The proxy server's IP address, if you connect through a proxy server. If you don't use a proxy server, leave this at 0.0.0.0.
Buffer size	Specify between 6000 and 64000. The larger the buffer, the better the download performance, but the more memory you will need on the computer where the FirstClass client is installed. The default of 10000 is normally adequate.

Link options	Window	Only affects UPD/IP connections. The size of the sliding window, in packets. Choices are:
		Auto	Your computer will determine the largest possible window size. We recommend this choice unless your connection fits one of the special cases described for the other choices.
		8	Choose this if you are connected over a link with long delays, such as a Wide Area Network (WAN) or satellite link. This choice trades off slower file transfers for better response to commands.
		16	Choose this on medium or slow connections, such as dialup.
		32	Choose this to get the best performance on fast 10MB or 100MB Local Area Networks (LANs).
	Packets	Only affects UPD/IP connections. The maximum packet size. You may need to set this if you are communicating over multiple network types. Larger packets are more efficient, but will slow down the response to other commands while file transfers are in progress. Packet size choices are:
		Auto	We recommend this choice unless your connection fits one of the special cases described for the other choices.
		232	This will improve response to commands at the expense of file and text transfer speed.
		512	Choose this for slower dialup connections to prevent file transfers from slowing down response too much. This is the best choice for dialup IP.
		1024	This is the best choice for maximum file transfer performance on fast 10MB or 100MB networks.
	Lock	Whether to decrease the packet size if transmission errors are encountered. Choices are:
		None	Allows FirstClass to change the packet size. We recommend this choice.
		size	Locks the packet size at the size you choose.
	Encrypt	Whether to encrypt transmitted data. Note Remember that the level of security you choose will be used by default for all of your settings files which use this connection protocol. If you want to override this default for a particular settings file, update "Encryption" on the Service Setup form. Choices are:
		Password Only	Doesn't encrypt data. Suitable for a secure network connection such as one that ties together your system's components when they are on different machines.
		Secure	FirstClass standard encryption, which encrypts data at a basic level. This is most frequently used on networks when you want a fast connection and aren't particularly concerned about security.
		CAST-128	CAST-128 encryption, which encrypts data in a more secure manner than Secure. It is equivalent to the security used, for example, when you do banking on the Internet. The first time you log in with CAST-128 encryption, you might find that it takes a little longer than normal to connect. You won't notice this slowdown on subsequent connections.
Trace options	The events for which you want trace information. Selecting "Packets sent" or "Packets received" may decrease your link speed significantly, because FirstClass must then write a great deal of data to disk.