Is it possible, bind has done but the OS still respond with ICMP destination unreachable

Hi,

I encounter a problem seems strange. I ran ser(a open source SIP
server) which binds to the port 5060. After the system starting up, I
can see aparently that the ser has successfully bind to UDP 5060. But
when other machine send packets to 5060(UDP), the OS responds it with
ICMP error(destination unreachable, port unreachable), any other
possibilities will cause this?

I am using ubuntu 6.10.

Thanks in advance.

abai

.

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