Sending data over internet using web service

[Jonathan Woods]

Hi there,

I have encountered problem of losing data sending over internet using
web service. I consume web service that connected Oracle Database. I
submit 687 SOAP Messages to 1 Web Method concurrently. (With
synchronize method)

[WebMethod]
public bool SubmitDPSuccessResult(string dpNo,string tkNo,string
plNo,string siteNo,int tid )

Only 253 Message can send successfully. 434 Message are lost in the
middle of sending over internet.
My question is how to reduce risk of losing data? Any factors do I need
to take into consideration? For example, internet bandwidth, firewall
settings etc.

Any suggestion and recommendation would be truly appreciated.

Regards,
Jonathan