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Brilletje,
I had a simular problem. After contacting my host I was told it was because I didn't have enough out going ports on the router my server was on. I was using a shared hosting package. My host (bluehost.com) openend a few extra ports on the router for me, but did let me know that if I needed more I would have to pay for a static ip. After my host made the changes I have experienced no problems. Hope that helps.
don (el paso)
motto - green chili for everything!