質問編集履歴
1
エラーログ追加
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@@ -46,4 +46,17 @@
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■JDKインストール（java-1.8.0-openjdk java-1.8.0-openjdk-devel ）
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エラーログ
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```
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Jul 3 04:18:26 ip-172-00-00-46 sshd[18980]: Address 54.000.000.14 maps to ec2-54.000.000.14.ap-northeast-1.compute.amazonaws.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
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Jul 3 04:18:26 ip-172-00-00-46 sshd[18980]: Connection closed by 54.000.000.14 port 49742 [preauth]
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Jul 3 04:18:52 ip-172-00-00-46 sshd[18984]: Address 54.000.000.14 maps to ec2-54.000.000.14.ap-northeast-1.compute.amazonaws.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
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Jul 3 04:18:52 ip-172-00-00-46sshd[18984]: Connection closed by 54.250.194.14
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port 49744 [preauth]
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Jul 3 04:19:39 ip-172-00-00-46 sshd[18988]: Address 54.000.000.14 maps to ec2-5
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4.000.000.14.ap-northeast-1.compute.amazonaws.com, but this does not map back to
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the address - POSSIBLE BREAK-IN ATTEMPT!
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Jul 3 04:19:39 ip-172-00-00-46 sshd[18988]: Connection closed by 54.000.000.14 port 49746 [preauth]
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```
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