timed out while receiving the initial server greeting
If you use postfix running on Linux and If you try to telnet the above host on port 25, the connection is made but the remote mail server doesn't send its 220 message upon connection.
for resolving it: echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
1 comment:
Might be nice to include some form of explanation on what this setting actually does and why it's needed.
Here's a reference to some info on windowing itself, but how it applies to the issue you're discussing is a blank you would need to fill in.
http://en.wikipedia.org/wiki/TCP_window_scale_option
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