The connection might drop because of a few causes:
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The Internet connection isn't active on your computer or on the target's computer. You will need to contact him through telephone to see exactly where is the problem.
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The software crashed and it needs a new launch. The other users needs to do this on his computer.
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The software was blocked by the installed Firewall or local policy settings.
You need to check all these causes to see exactly where is the problem.