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Why are some Macintosh clients with AOL 3.0 having connection problems?
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A. There is a known problem in the AOL 3.0 client for the Macintosh that affects some transactions on secured web sites, causing the connection to hang. AOL 4.0 resolves this problem; the following section addresses the solution for current AOL 3.0 Macintosh clients who have not yet upgraded to AOL 4.0.
Path MTU Discovery is a TCP protocol used to determine the largest unfragmented packet size than can go through the network. When the client software performs Path MTU Discovery, you can set the DF (don't fragment) bit, which causes a packet to be dropped if it is too large. If the packet is dropped, you receive an Internet Control Message Protocol (ICMP) message that alerts you to reduce future packet sizes and retransmit the last packet. For security reasons, many secured web sites block ICMP messages. If you decide to block ICMP messages, use one of the following ways to stop the connection from hanging:
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Disable Path MTU Discovery on the last router before your firewall to allow the client to receive an ICMP message.
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Allow ICMP messages to go outbound, but block the ICMP packets inbound through your routers.
