Certificate Authority (CA) StartCom announced last week, on Friday, its intention to cease operations by 2018, and completely shut down its certificate infrastructure by 2020. The decision came after all major browser vendors banned StartCom and WoSign SSL certificates in their products. Both companies failed to inform browser vendors that Chinese-based WoSign bought EU-based StartCom in the autumn of 2015. The two companies are now owned by Chinese cyber-security giant Qihoo 360. The liquidation procedure will begin and follow our CPS and internal procedures.
Source: https://www.bleepingcomputer.com/news/security/ssl-certificate-provider-startcom-shuts-down-after-browser-ban/