Rubber/plastic cap on each end covers too much of the RJ45 body. The cover protrudes and prevents the clip from snapping into place on some sockets. Essentially, the connector can't go far enough to engage the clip. I was able to connect it to my switch, but the device on the other end would not connect. I managed to get a precision knife to the lid and remove part of the lid to make it work (see photo). Other reviews point to the same issue. Aggravating.
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