I properly installed CLI. In a command window, I enter:

sfdx force:auth:web:login -d -a DevHub

in order to log in to the trial Dev Hub that I created. The aforementioned command opens the Salesforce login page in the web browser, so I log in using my Developer Hub Trial Org credentials and click Allow. After that, web browser show me an error: "This site can't be reached. localhost took too long to respond".

This is the URL that Salesforce use after I authenticate in the browser: http://localhost:1717/OauthRedirect?code=aPrxbOND3gL_2LbSR7rKPdvD0XBVk2YpErl3pphY2f3xvZ1wf5SSPJByDleRLPMtzCQWnNGAdg%3D%3D&state=f2f8254fac23

I don't know what happen.

When I deploy external object through Metadata API, it dosn't add any custom fields so I can't use the fields.

Details:
version: 39.0
1. On "Setup page"  > External Objects > Custom Fields & Relationships
    I can see all custom fields, which is good.
2. On "workbench.developerforce.com" > Standard & Custom Objects
    I can't see any custom fields here! Is it a bug?

When I delete the external object and add again by "Validate and Sync" through "Setup page", I can see all custom fields on "workbench.developerforce.com".
It happens only when I use metadata API.
It means if I want to remove/add any fields/external objects, I need to delete all related classes/objects first and sync the external object on GUI...

Does anyone have same issue or workaround?
Thanks