On Monday 31st August 2020, TLS v1.0 will be disabled on all Aconex production and sandbox instances.
Aconex recommends customers opt for solely using TLS version 1.2 or higher in all interactions with Aconex Web Service APIs.
Organizations with existing integration tools using the Aconex Web Service APIs that use the TLS 1.0 encryption are recommended to update these tools to use TLS v1.2 or higher.
All Aconex supported browsers offer TLS v1.2 support, so desktop browsing of the instance will not be affected.
Please refer to this initial post from 2018 for more details: https://help.aconex.com/forums/api-news-announcements/tls-10-no-longer-supported-apidevaconexcom-sandbox-environment