I had a trouble when logging in some websites such as hotmail with Mozilla (Firefox).
The hardware is Motorola SB5100 cable modem and Netgear RIP614 router (firmware 4.15RC4)The systems worked properly with Sympatico and Execulink ADSL high-speed connections. After switching to Rogers Cable high speed Internet, logging on to hotmail's web-mail failed and was pending on "transferring data from server".
Solution: reduce the MTU size for the connections.
Linux: [root] # /sbin/ifconfig eth0 mtu 1418
Windows XP: Modify the Windows' Registry by command "regedit": in the tree of "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces", find out the network card's entry, something like "{C42A4EA1-8C79-48F4-9309-99D7DE35D462}", add a DWORD value with name of "MTU", select "Decimal" base and input the value data of "1418"; save and quit.
A MTU size of 1418 bytes is small enough to solve the problem in most cases. Basically a MTU of 1448-1472 bytes should work for most network environment.
