• Google Chrome, version 49 and above.
  

• Mozilla Firefox, version 44 and above.
  

• Safari, version 9 and above.
  

• Internet Explorer, version 11 and above.
  

• Opera, version 45 and above.
  

• Google Android, version 4.1 and above.
  

• iOS, version 10.0 and above.
  

• Java 6u45
  

• Java 7u25
  

• OpenSSL 0.9.8y
  

• .NET 4.5 and below
  

• .NET 4.5 (settings should be changed to enable TLS 1.2)
  

• MS Outlook plug-in 32 bit
  

• MS Outlook plug-in 64 bit
  

EU

• MS Outlook plug-in 32 bit
  

• MS Outlook plug-in 64 bit
  

Transport Layer Security (TLS) is a cryptographic technology protocol used to provide secure transfer of sensitive information over the internet.

According to PCI standards, TLS v1.2 is the most advanced protocol yet as it eliminates the vulnerabilities faced by the previous versions, i.e, TLS v1.0 and v1.1. All users who use secure servers and browsers to access the data and API from Zoho are expected to make this update. If you are using a Webhook to link Zoho to an external site, your browsers are required to support HTTPS and TLS v1.2. 

Refer to this link for further details regarding the requirements. 

• Click here to know if your browser’s compatible with TLS v1.2.
  

• If the response {"status": 200,"message": "Connection Success","version": "TLSv1.2"}  is displayed, it means that you are connecting to our APIs using TLS 1.2.
  

• If the response says "Connection failed", the changes mentioned in the above post must be implemented to continue integrating with our APIs.