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BalajiSundarBalajiSundar 

There was an unhandled exception. Please reference ID: OJIDLGFA. Error: Faraday::ConnectionFailed. Message: Failed to open TCP connection

Customize Your Login Process with My Domain

When I try to launch my trailhead developer edition, It fails with below error

"This site can’t be reached
curious-badger-vv2jvj-dev-ed.my.salesforce.com’s server IP address could not be found."

I am guessing because of the new domain created. 

But the trailhead is still trying to connect the old domain how to make it redirect it to new domain.
Please help me complete this challenge
Khan AnasKhan Anas (Salesforce Developers) 
Hi Balaji,

Greetings to you!

Please refer to the below link which might help you further with the above issue.

https://developer.salesforce.com/forums/?id=9060G0000005cS4QAI

If the problem persists, I suggest you please reach out to the trailhead support team so that they can look into it and can do a password reset for your playground.

Please refer below link to open a case:
https://trailhead.salesforce.com/help?support=home

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas
Sachin Deshmukh 5Sachin Deshmukh 5
I faced same issue, I simply used the incognito mode and voila! It worked!

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