On the evening of August 12th， users of China Unicom， primarily in Beijing， reported widespread network disruptions on social media platforms. The outage rendered many websites and applications inaccessible， causing significant inconvenience and user frustration.
First-hand accounts from affected users painted a clear picture of the severity. One user shared， “Around 8 PM， I encountered the same issue at the company. Both the Douyin and Weibo webpages were unopenable.” Another user recounted a more critical situation， stating， “I was charging my car in the rain and was in the process of making a payment when everything suddenly failed.” These anecdotes highlight how the network issues impacted daily activities and essential services.
Industry observers and tech bloggers quickly provided insights into the technical cause. One prominent blogger pointed out， “Unicom’s DNS has been polluted， with a large number of domain names incorrectly resolving to 127.0.0.2.” Another added， “Unicom’s DNS experienced issues， causing many major sites’ domain names to be resolved to 127.0.0.2.” This points to a likely Domain Name System (DNS) poisoning or corruption issue within Unicom’s network， which is critical for translating human-readable domain names into IP addresses. When DNS servers are compromised， they can provide malicious or incorrect IP addresses， effectively preventing access to legitimate websites and services.
Following the widespread reports， Alibaba Cloud officially published an announcement on its website regarding the abnormal status of Unicom operator’s local DNS. The announcement stated that at 19:40 Beijing time on August 12， 2025， Alibaba Cloud’s monitoring systems detected an anomaly in Unicom’s local DNS， confirming that the issue was operator-related. Alibaba Cloud had already reported the incident to the operator for resolution.
By 20:48， the announcement confirmed that all affected services had been fully restored after urgent troubleshooting efforts. The swift resolution， however， does not diminish the impact of the outage， which highlights the critical reliance on stable DNS services for internet connectivity.
As of the time of reporting， neither the official Weibo account of “China Unicom Beijing Customer Service” nor “China Unicom Customer Service” had issued any public statement regarding the incident.
