SQL Server login failed for user error 18456

Question

I installed docker and I run this command in windows

docker run -e "ACCEPT_EULA=Y" -e "MSSQL_SA_PASSWORD=MyComplexPassword!234" -e "MSSQL_PID=sa" --cap-add SYS_PTRACE -p 1404:1433 -d microsoft/mssql-server-linux

then I donwloaded SQL Server 2012 and in the server name I write localhost and in login : sa password as you can see in the installation command.

but I get the error SQL Server login failed for user.

What is wrong?

Answer 1

The issue is your using localhost. Which not the interface where docker is listening

PS C:\> ipconfig

Windows IP Configuration


Ethernet adapter vEthernet (Temp Nic Name):

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::99d:bf5e:8700:56df%26
   IPv4 Address. . . . . . . . . . . : 172.27.219.121
   Subnet Mask . . . . . . . . . . . : 255.255.240.0
   Default Gateway . . . . . . . . . : 172.27.208.1

If you a ipconfig there would be a vEthernet interface. And a IP would be there. Use this IP to connect to the your DB server. Also make sure to provide the port # as 1404 while connecting

Answer 2

With -p 1404:1433 you mapped machine port "1404" to docker's default SQL Server port "1433". So your "Server Name" in SSMS should be localhost,1404 instead of simply localhost