Describes the cause and action for error messages.
Error Message(English)：
two factor auth
2 要素認証に 1Password を使うのはよく考えてから
https://blog.manabusakai.com/2016/01/rethink-two-factor-auth/
Two Factor Auth List
https://twofactorauth.org/
Sydney AWS Consultants: Amazon Workspaces with 2 factor auth
http://www.peninsula-it.net.au/technical-blog/amazon-workspaces-two-factor-auth/
AWS Marketplace: Cloud VPN (25 User Sessions)
https://aws.amazon.com/marketplace/pp/CipherGraph-Networks-Cloud-VPN-25-User-Sessions/B00EA2S2OA
security - Two Factor Authentication on EC2 - Server Fault
https://serverfault.com/questions/223235/two-factor-authentication-on-ec2
Topic: 2fa ・ GitHub
https://github.com/topics/2fa?l=go
Faster AWS/PayPal/TOTP two factor auth with Yubikey - RizviR
https://rizvir.com/articles/faster-TOTP-auth-with-yubikey/
How to Enable Multifactor Security on Amazon ? Krebs on Security
https://krebsonsecurity.com/2015/11/how-to-enable-multifactor-security-on-amazon/comment-page-1/
mfa - npms
https://npms.io/search?q=mfa