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"A connection could not be established..."

When attempting to connect to one of the the PC laptop on my list from an Intel iMac I receive a failed connection message. I have connected to the PC many times before. I can still connect to other computers on my list, both Mac and PC. Just not the one. I haven't made any changes to the PC. I'm wondering if something occurred during a Windows update. Are there some system settings I should be checking? Both the Mac and PC have the newest TeamViewer update.