Inada Naoki added a comment - 2021-03-06 11:50 Similar issue is reported to PyMySQL. https://github.com/PyMySQL/PyMySQL/issues/971 In this issue, "1130 host not allowed" error sent wrong sequence number. Please fix this issue ASAP. Otherwise, many users will report the issue to mysql drivers and drivers maintainers need to investigate the issues.

Kosh added a comment - 2021-04-11 23:16 I gathered the packet captures, i'll add them here to see if they help. mariadb.pcap.zip MariaDB 10.1: No. Time Source Destination Protocol Length Info 4 0.000155 172.17.0.2 172.17.0.1 MySQL 174 Server Greeting Error 1129   Frame 4: 174 bytes on wire (1392 bits), 174 bytes captured (1392 bits) Ethernet II, Src: 02:42:ac:11:00:02 (02:42:ac:11:00:02), Dst: 02:42:15:9f:91:76 (02:42:15:9f:91:76) Internet Protocol Version 4, Src: 172.17.0.2, Dst: 172.17.0.1 Transmission Control Protocol, Src Port: 3306, Dst Port: 55812, Seq: 1, Ack: 1, Len: 108 MySQL Protocol Packet Length: 104 Packet Number: 0 Error Code: 1129 Error message: Host '172.17.0.1' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'   0000 02 42 15 9f 91 76 02 42 ac 11 00 02 08 00 45 08 .B...v.B......E. 0010 00 a0 05 c9 40 00 40 06 dc 61 ac 11 00 02 ac 11 ....@.@..a...... 0020 00 01 0c ea da 04 10 f4 2e 63 96 4d aa 0e 80 18 .........c.M.... 0030 01 fe 58 b8 00 00 01 01 08 0a 30 31 70 95 13 a7 ..X.......01p... 0040 d6 4f 68 00 00 00 ff 69 04 48 6f 73 74 20 27 31 .Oh....i.Host '1 0050 37 32 2e 31 37 2e 30 2e 31 27 20 69 73 20 62 6c 72.17.0.1' is bl 0060 6f 63 6b 65 64 20 62 65 63 61 75 73 65 20 6f 66 ocked because of 0070 20 6d 61 6e 79 20 63 6f 6e 6e 65 63 74 69 6f 6e many connection 0080 20 65 72 72 6f 72 73 3b 20 75 6e 62 6c 6f 63 6b errors; unblock 0090 20 77 69 74 68 20 27 6d 79 73 71 6c 61 64 6d 69 with 'mysqladmi 00a0 6e 20 66 6c 75 73 68 2d 68 6f 73 74 73 27 n flush-hosts' MariaDB 10.4: No. Time Source Destination Protocol Length Info 4 0.000544 172.17.0.2 172.17.0.1 MySQL 174 Response Error 1129   Frame 4: 174 bytes on wire (1392 bits), 174 bytes captured (1392 bits) Ethernet II, Src: 02:42:ac:11:00:02 (02:42:ac:11:00:02), Dst: 02:42:15:9f:91:76 (02:42:15:9f:91:76) Internet Protocol Version 4, Src: 172.17.0.2, Dst: 172.17.0.1 Transmission Control Protocol, Src Port: 3306, Dst Port: 55324, Seq: 1, Ack: 1, Len: 108 MySQL Protocol Packet Length: 104 Packet Number: 1 Response Code: ERR Packet (0xff) Error Code: 1129 Error message: Host '172.17.0.1' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'   0000 02 42 15 9f 91 76 02 42 ac 11 00 02 08 00 45 08 .B...v.B......E. 0010 00 a0 ba 05 40 00 40 06 28 25 ac 11 00 02 ac 11 ....@.@.(%...... 0020 00 01 0c ea d8 1c a2 b3 30 3d 5c 3f e4 6d 80 18 ........0=\?.m.. 0030 01 fe 58 b8 00 00 01 01 08 0a 30 2c 43 33 13 a2 ..X.......0,C3.. 0040 a8 ed 68 00 00 01 ff 69 04 48 6f 73 74 20 27 31 ..h....i.Host '1 0050 37 32 2e 31 37 2e 30 2e 31 27 20 69 73 20 62 6c 72.17.0.1' is bl 0060 6f 63 6b 65 64 20 62 65 63 61 75 73 65 20 6f 66 ocked because of 0070 20 6d 61 6e 79 20 63 6f 6e 6e 65 63 74 69 6f 6e many connection 0080 20 65 72 72 6f 72 73 3b 20 75 6e 62 6c 6f 63 6b errors; unblock 0090 20 77 69 74 68 20 27 6d 79 73 71 6c 61 64 6d 69 with 'mysqladmi 00a0 6e 20 66 6c 75 73 68 2d 68 6f 73 74 73 27 n flush-hosts'

Haidong Ji added a comment - 2022-01-12 01:50 - edited This is great, thanks, @wlad! I've applied your change to my local 10.6 branch, built and tested it successfully. The new build now provides the correct error packet back to the client when `max_connect_errors` has been reached. `telnet` example below: haidong@ryzenkde:~/messAround$ telnet 192.168.1.186 3306 Trying 192.168.1.186... Connected to 192.168.1.186. Escape character is '^]'. nHost '192.168.1.153' is blocked because of many connection errors; unblock with 'mariadb-admin flush-hosts'Connection closed by foreign host. `pymysql` example below: haidong@ryzenkde:~/messAround$ python testConn.py Traceback (most recent call last): File "/home/haidong/messAround/testConn.py", line 3, in <module> connection = pymysql.connect(host='192.168.1.186', File "/usr/lib/python3.10/site-packages/pymysql/connections.py", line 353, in __init__ self.connect() File "/usr/lib/python3.10/site-packages/pymysql/connections.py", line 632, in connect self._get_server_information() File "/usr/lib/python3.10/site-packages/pymysql/connections.py", line 1055, in _get_server_information packet = self._read_packet() File "/usr/lib/python3.10/site-packages/pymysql/connections.py", line 725, in _read_packet packet.raise_for_error() File "/usr/lib/python3.10/site-packages/pymysql/protocol.py", line 221, in raise_for_error err.raise_mysql_exception(self._data) File "/usr/lib/python3.10/site-packages/pymysql/err.py", line 143, in raise_mysql_exception raise errorclass(errno, errval) pymysql.err.OperationalError: (1129, "192.168.1.153' is blocked because of many connection errors; unblock with 'mariadb-admin flush-hosts'") Previously with the bug, the output from `pymysql` is: pymysql.err.InternalError: Packet sequence number wrong - got 1 expected 0