Salesforce is disabling TLS 1.0 which is planned to be implemented by June, 2016. Depending on your instances, please refer the below link for more details:
Link: https://help.salesforce.com/apex/HTViewSolution?id=000221207
In
order to support these changes made by Salesforce.com®, we request you
to perform following steps on your FTP Attachments® configuration.
For Standalone Version:
As
you might be already aware that Salesforce.com is disabling TLS1.0,
this will also impact your FTP Attachments® installation. We request you
to take following actions asap.
- Install .NET framework 4.5 on your Application server (IIS) where your FTP Attachments® build is hosted.
- Please make sure that TLS 1.2 is enabled on your server.
- Install and configure our new build i.e FTP Attachments® version 4.6 which is compatible with the Salesforce.com® with TLS 1.0 disabled. Kindly hit the below link to install the new build of FTP Attachments®:
Link: http://app.ftpattachments.com/downloads/standalone.sforce.zip
Note:
We request you to please consult your System Administrator before
making above changes. We highly recommend that you first make these
changes on your test environment, test it thoroughly and only then apply
them to your production environment.
For Hosted Version:
We have already made the respective changes from our end, so you don't need to perform anything at your end.