我的 error.log 中的未知客戶端

我最近重新安裝了我的 VPS 作業系統，目前我的 public_folder 中沒有任何網站。為了調查 dovecot 錯誤，這當然不是我的問題，我發出

tail -n 20 domains/mydomain.com.error.log

這產生了

[Sat Aug 09 01:53:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 01:54:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 01:55:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 01:56:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 01:57:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 01:58:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 01:59:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:00:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:01:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:02:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:03:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:04:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:05:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:06:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:07:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:08:42 2014] [error] [client 141.8.xxx.x] File does not exist: /home/admin/domains/domain.com/public_html/robots.txt
[Sat Aug 09 02:08:42 2014] [error] [client 141.8.xxx.x] File does not exist: /home/admin/domains/domain.com/public_html/robots.txt
[Sat Aug 09 02:08:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:09:53 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1
[Sat Aug 09 02:10:54 2014] [error] [client 158.58.xxx.xxx] File does not exist: /home/admin/domains/domain.com/public_html/folder1

我無法理解的是 IP 地址 158.58.xxx.xxx 和 141.8.xxx.x 不屬於我作為上述行中的客戶端。你能解釋一下這些線的意思嗎？它們與我的 public_folder 有什麼關係？

提前致謝。

這些很可能是“背景噪音”——大型殭屍網路一直在試圖找到伺服器中未修補的安全漏洞並加以利用。

如果您的流量僅來自一組固定地址，您可以配置防火牆以阻止除有效地址之外的所有內容，但在大多數情況下，這是我們必須忍受的（當然，還要保持我們的伺服器打更新檔和安全）。

引用自：https://serverfault.com/questions/619121