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sumanth v 7sumanth v 7 

How we can check TLS version of the salesforce org?

System.CalloutException: Server chose TLSv1, but that protocol version is not enabled or not supported by the client. 

 
Best Answer chosen by sumanth v 7
Naveen DhanarajNaveen Dhanaraj
TLSv1 is a security protocol used by web services to talk to each other. If this version of TLS is disabled in your Salesforce service then you might face this issue with the above mentioned error.

You can easily re-enable TLSv1 by doing the following.
1) Go to Build > Critical Updates
2) Under the Update Name column, look for "Require TLS 1.1 or higher for HTTPS connections"
3) For the row that has "Require TLS 1.1 or higher for HTTPS connections", click the "Deactivate" link

If you want to reactivate this update in the future, just click the "Activate" link. 

If this option not available on Sandbox for your org you might need to get in touch with salesforce for that

All Answers

Naveen DhanarajNaveen Dhanaraj
Hi sumanth,
Salesforce disabling TLS 1.0----->>https://help.salesforce.com/apex/HTViewSolution?id=000221207
Naveen DhanarajNaveen Dhanaraj
TLSv1 is a security protocol used by web services to talk to each other. If this version of TLS is disabled in your Salesforce service then you might face this issue with the above mentioned error.

You can easily re-enable TLSv1 by doing the following.
1) Go to Build > Critical Updates
2) Under the Update Name column, look for "Require TLS 1.1 or higher for HTTPS connections"
3) For the row that has "Require TLS 1.1 or higher for HTTPS connections", click the "Deactivate" link

If you want to reactivate this update in the future, just click the "Activate" link. 

If this option not available on Sandbox for your org you might need to get in touch with salesforce for that
This was selected as the best answer
sumanth v 7sumanth v 7
Thank You Naveen Dhanaraj.