Ethernet cable does not make a solid connection...

I have two Shields, one immediately connected to my network when I plugged in an ethernet cable. The other does not and is still connecting via Wi-Fi. I've checked the cable and it works. The pins inside the port are also in good condition. Even though the cable snaps in, I don't believe it is deep enough to connect with the port. When I push the cable in harder, it will establish a connection. So, questions is, how do I rig something up to force the cable deeper inside the port? I've tried zip ties to no avail(although maybe thinner ties would work better???).