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How do I get rid of this message and in fact manage to update the machine?

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I can browse internal and external websites fine, name resolution works fine, a packet capture tcpdump -i en7 port 53 and subsequent analysis of the dump using tshark shows that the name software update requires resolves just fine:

1   0.000000 ww.xx.yy.zz → vv.ww.xx.yy  DNS 76 Standard query 0xc474 A swscan.apple.com
2   0.014597  vv.ww.xx.yy → ww.xx.yy.zz DNS 210 Standard query response 0xc474 A swscan.apple.com CNAME swscan-cdn.apple.com.akadns.net CNAME swdist.apple.com.edgekey.net CNAME e5977.e9.akamaiedge.net A 104.113.184.251
  • No ideas? Comments? – tink Mar 21 at 22:52

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