Regular DNS Resolver "Connection refused" errors
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I get a lot of "Connection refused" errors in my DNS Resolver logs. It seems to occur after unbound restarts and it's always the same DNS IP addresses in the logs but different numbers of the same errors. None of these IP addresses are familiar to me though. This may be just a benign issue, but I don't like seeing recurring errors like this and would like to understand it so I can either correct the root cause, or just accept this is how it's going to be.
My DNS servers from my ISP and that I manually configured from the main status page are:
- 127.0.0.1
- 75.75.75.75
- 75.75.76.76
- 8.8.4.4
- 9.9.9.9
- 8.8.8.8
Here are the DNS Resolver errors:
May 27 07:27:08 unbound 65719 [65719:0] info: start of service (unbound 1.13.1). May 27 07:27:24 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.113.1 port 53 May 27 07:27:24 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.121.1 port 53 May 27 07:27:24 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.121.1 port 53 May 27 07:27:24 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.113.1 port 53 May 27 07:27:24 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.113.1 port 53 May 27 07:27:33 unbound 65719 [65719:1] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:34 unbound 65719 [65719:1] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:34 unbound 65719 [65719:1] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:34 unbound 65719 [65719:1] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:34 unbound 65719 [65719:1] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:34 unbound 65719 [65719:1] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:35 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:35 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:35 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:35 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:37 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:37 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:37 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:38 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 May 27 07:27:38 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.112.1 port 53 May 27 07:27:38 unbound 65719 [65719:0] error: read (in tcp s): Connection refused for 199.249.120.1 port 53 -
Updating to 21.05-RELEASE seems to have resolved this issue.