mysql客户端更改IP

Question

several of client boxes changed their IPs and now those boxes can not access the database. at best the connection is on and off (mostly off). other boxes which do not have their IPs changed can access the db fine. btw, I have troubleshoot from networking side and found no issue. I have been told/heard that mysql db maintain somekind of ip-hostname tables/lookup table? could this be the problem . how to solve this?

MySql.Data.MySqlClient.MySqlException: Reading from the stream has failed. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at MyNetworkStream.HandleOrRethrowException(Exception e)
   at MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.MySqlStream.LoadPacket()

Answer 1

检查您使用的用户是否在MysqlWorkbench中配置了“限制主机匹配的连接性”选项

Answer 2

MySQL identifies user accounts by combination of username and hostname. The hostname can be domain name or IP address. The hostname can be wildcarded. See the documentation .

User accounts are stored in the system mysql database, table user . You can manipulate it directly, on you can use GRANT SQL statement to grant access for your new IP addresses, for example:

GRANT ALL ON mydatabase.* TO 'myusername'@'123.45.67.%' IDENTIFIED BY 'xyz';

This will grant all privileges on all tables of “mydatabase” database to users connecting from any IP address starting with “123.45.67.” with username “myusername” and password “xyz”.

You might need to issue FLUSH PRIVILEGES SQL statement after modifying user accounts.