Hello..I'm getting quite a few of these write errors and broken pipes in my log. Based on the random usernames associated, I'm guessing someone is trying to spam/ddos/hack? my server..but I'm not sure. Normal users are able to connect without issue. I also have PAM enabled.

User "zFXC2n1KEoU3!zFXC2n1KEoU3@<scrubbed>" unregistered (connection 25): Write error. Connection 25 with "127.0.0.1:39102" closed (in: 1.1k, out: 10.2k). Write error on connection 27 (socket 27): Broken pipe! Shutting down connection 27 (Write error) with "127.0.0.1:39104" ... User "fUAQTQEbC4h!fUAQTQEbC4h@<scrubbed>" unregistered (connection 27): Write error. Connection 27 with "127.0.0.1:39104" closed (in: 1.1k, out: 10.1k). Write error on connection 32 (socket 32): Broken pipe! Shutting down connection 32 (Write error) with "127.0.0.1:39109" ... User "p_Yc__a!p_Yc__a@<scrubbed>" unregistered (connection 32): Write error. Connection 32 with "127.0.0.1:39109" closed (in: 0.9k, out: 9.6k). Write error on connection 33 (socket 33): Broken pipe! Shutting down connection 33 (Write error) with "127.0.0.1:39110" ... User "gFY!gFY@<scrubbed>" unregistered (connection 33): Write error. Connection 33 with "127.0.0.1:39110" closed (in: 0.6k, out: 9.2k). Write error on connection 34 (socket 34): Broken pipe! Shutting down connection 34 (Write error) with "127.0.0.1:39111" ... "wkYPV!wkYPV@<scrubbed>" unregistered (connection 34): Write error.