There are various causes for this, including faulty installation, incompatibility between the TeamViewer versions installed on both computers, etc. Fix Partner did not connect to router TeamViewer ...

TeamViewer has also improved its usability with a revamped look and feel of its user interfaces, as well as considerable remote printing improvements including support for HP printers.

TeamViewer® Announces iOS Apps for File Transfer Between iPhone®, iPad® and Computers Users can now transfer any file from their mobile device to a computer (and vice versa) ...