Click Windows, enter "cmd" (without quotes), then ENTER for a DOS prompt.
Then type "ipconfig /all | more"
Look for "Default Gateway", this will be your routers IP address in most cases (just in case it is not 192.168.0.1, 192.168.1.1, etc.). I say router, because that is the portion of the "DSL modem" (which is actually a "modem", router and switch combined) that we're concerned with.
Sometimes, these ports are blocked just because they're uncommon and it's there for "your safety". If you cannot change them, ask them to push a config with the appropriate ports open.
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