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I suspect that the "white residue" between the coax cable jacket and connector is the result of environmental damage but I could not confirm it yet. Did anyone have a similar issue and if so what was the cause? Thanks, AL6B.

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    $\begingroup$ Can you try again to take the picture and ensure it is focused on the cable and not the background? It's hard to tell the key details and I suspect that I have a different answer than has already been posted but it's not possible to see the details with this much blur. $\endgroup$ – Kevin Reid AG6YO Jul 19 '18 at 16:23
  • $\begingroup$ Kevin, I've just added a better picture. I'd would be interested in your opinion. Thanks, AL6B. $\endgroup$ – paul0207 Jul 20 '18 at 3:06
  • $\begingroup$ Thanks. I've taken a look and on further thought I don't have anything to add. I thought it might be a harmless case of the heat-shrink separating from the jacket but I now think the existing answer has it right. $\endgroup$ – Kevin Reid AG6YO Jul 20 '18 at 3:36
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It appears to be typical moisture ingress. The joint between the coax and the connector is not inherently waterproof. A damaged jacket can also be the source of moisture ingress. Normally the connector to coax joint must be covered with a self sealing adhesive tape or heat shrink tubing with an interior thermal adhesive in order to protect it from the elements. If the connector is a PL259 the entire connector should be dressed similarly since it also is not waterproof.

Unfortunately, the jacket corrosion also impedes the proper flow of RF current. You may be able to cut off a foot or two and if there is no further corrosion, you can then install a new connector and waterproof the assembly.

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