I was able to track down the problem, with a little help:
http://www.codeproject.com/script/co...mid=1649&selec
t=1164577&df=100&msg=1164577#xx1164434xx

Try using the overloaded method which uses
int Send(byte[] dgram, int bytes, reomteIPEndpoint IPEP), rather than
int Send(byte[] dgram, int bytes, string hostname, int port)
...

The second calls DNS.Resolve...


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