TIA portal - failed to establish a connection
Nothing special, TIA is a master of troubles and issues. First, make a correct settings for your PC ethernet NIC, make the IPv4 to be in the same subnet, for example 192.168.0.150. Then plug the cable from your PC to PLC, choose PN/IE, select the NIC you want to use (those that you configured a static IPv4), direct slot x1, start search.
If it doesn't work restart the PC.