无法从Windows PC连接任何指定的MySQL主机c＃应用程序，尝试在Ubuntu 16.04服务器上连接mysql服务器

Question

I have C# application installed all my LAN PC having windows 10 OS, and my central server has Ubuntu 16.04 installed on which mysql server is installed and my C# application communicate to the central server, it's working well some time, but some time it gives "unable to connect any of the specified MySQL host.

I have changed mysql configuration file as: bind-address to "my server ip address" and also check it by "0.0.0.0", make #skip-networking comment, open 3306 port, allowed 3306 port in firewall, increase max_connections, grant user to access from % address,

And in my c# application i used standard way of connection string

It was working very well before when my server was on windows, It is working very well without any error from my website

Answer 1

Check connection string. Some times it's matter for Mysql (with spaces!):

Server=server_host_name; Port=port_number; Database=myDataBase; Uid=user_name; Pwd=passwoed;