Wierd error in sending data via TCP

[Navin Mishra]

Hi,

I've a service that connects to the clients via TCP and sends data on
client's opened TCP port. The data is in XML and I use ASCII encoding. There
is 8 byte of header containing length of data in text appended to the TCP
payload. So, if 1260 bytes of data needs to be sent, the header pre-pended
is 00001260 and total 1268 bytes is sent.

It works fine on my developoment and test system. Until on another system
sometimes the 8 bytes of header is NOT received correctly by clients.
Sometimes it is 001260 or sometimes there are some garbage characters in
front of the length xxxx5268. Ethereal trace shows the same thing. But the
service log shows that the data was sent successfully.

Here is the service sample code used to send data to the connected client:

private bool Send(string strXML)
{

int ret = 0;

strXML= strXML.Replace( "utf-16","UTF-8");

int len = strXML.Length;

string header = len.ToString("0 0000000");

string strTotalData = string.Format(" {0}{1}", header, str);

ASCIIEncoding asen = new ASCIIEncoding() ;

byte[] ba = asen.GetBytes(s trTotalData);

try

{

Monitor.Enter(t his);

{

ret = m_Socket.Send(b a);

if ( ret != 0 )

LogAdv("Sent " + ret + " bytes so far !", false);

}

}

catch(Exception ex)

{

Misc.Globals.Lo gError(GetName( ),"Error in sending to " + m_strChannelNam e +
"!" + ex.ToString(), ref m_EventLogger);

m_strErrorMsg = ex.Message;

return false;

}

finally

{

Monitor.Exit(th is);

}

return true;

}

Anything wrong with this ?

Any advice appreciated!!!

Thanks in advance and regards

Navin