authorize.net SSL error for only 1 campaign

Hi,

We have over 60 campaigns running on JoomDonation 4.3 and Joomla 3.6.4. Everything is working great except 1 error, which we can recreate.

The error is shown on the attached screen shot, and occurs on just 1 of the campaigns, number 16, and when credit card payment is entered:

Campaign alias: harry-hoffman-fund
Donation form menu item alias: harry-donations
Donation form menu item link: index.php?option=com_jdonation&view=donation&campaign_id=16

Error: 0 - [curl] 35: Unknown SSL protocol error in connection to secure.authorize.net:443 secure.authorize.net/gateway/transact.dll
Sorry, that page must have moved

The URL in the address bar displays " ntsad.org/index.php/harry-donations ", which is a valid URL

The last donation accepted on this campaign was November 2016 so something has happened since then. Other campaigns are accepting credit cards. I am at a loss how to proceed on fixing this problem and seek your advice.

Thank you,
Peg

Another of our campaigns is having the same error. Opening a support ticket.