can you connect that sql server with using ssms or one of visual studio sql server extension? That server may only accept Windows Authentication mode.
Did you add your registerer to IocManager? see : https://github.com/aspnetboilerplate/aspnetboilerplate/blob/f4b34279b743319d922a02a2246a1af9b7255886/src/Abp/AbpKernelModule.cs#L45
Search localhost in all solution, change necessary urls. Count depends on what you are using.
you want Hangfire to work with tenant databases?
We don't have such an integrated by default.
you can create custom repository. see:https://aspnetboilerplate.com/Pages/Documents/EntityFramework-Integration#custom-repositories
You can create db context for each custom repository if you have a few connection string.
Steps: Create dbcontext and then configure them with their connection strings.
see: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core?searchKey=DbContext%20#configuration
Then create custom repositories for them
What is an error ? Can you please share more information. Error message or screnshot.
I don't have an example project but documents has all of them. see: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core
creating db context: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#dbcontext configuring db context: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#configuration creating custom repositories from db context: https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#custom-repositories
https://aspnetboilerplate.com/Pages/Documents/Entity-Framework-Core#configuration says that:
"ABP can use IConnectionStringResolver to determine it. This behaviour can be changed and the connection string can be determined dynamically."
I never try it, but i think you should try it before them https://support.aspnetzero.com/QA/Questions/7386#answer-266967fa-ea7f-b56e-03ee-39ef3b733097