![]() The browser extension blocks video ads, interstitial ads, floating ads, pop-ups, banners, and text ads. ![]() Features ĪdGuard Home acts as a recursive DNS resolver, which prevents most advertisements from displaying by responding with an invalid address for domains that appear in its filter lists. In 2014 AdGuard Software Limited's products became available in Cyprus, to where its headquarters were subsequently moved. ĪdGuard Software Limited was founded in 2009 in Moscow. AdGuard is also available as a browser extension. Separate automated tests to check the creation of the exception list for DNS rate limiting have been added to the management service test suite.AdGuard is an ad blocking service provided by AdGuard Software Limited with applications for Microsoft Windows, Linux, MacOS, Android and iOS.Automated notifications for increased DNS errors on VPN servers are now set up.To prevent similar problems in the future, we are taking the following steps: Below, you can see how much more DNS errors were registered in the system during the outage.ĩ:14 UTC: Deployment of the management service fails.ĩ:30-9:40 UTC: We start getting the first individual complaints from users.ĩ:40-10:00 UTC: Investigating and searching for the source of the problem.ġ0:00-10:20 UTC: Preparing a fix in the management service.ġ0:20-10:30 UTC: Deploying the new version of the management service.ġ0:30-10:35 UTC: Restart of AdGuard DNS Follow-up steps Had we noticed this in time, the resolution time would have been significantly shorter. Some might not have noticed the issue at all.įinally, to our embarrassment, we had not set up automatic notifications for an increase in the number of DNS errors. DNS query results are cached by the operating system, so everything seems to work fine for a while, and then a small portion of domains become inaccessible. Secondly, users did not immediately realize the nature of their problem. Firstly, there were no problems observed in smaller locations. The problem was exacerbated by several factors that delayed our understanding of what was happening. The 'busiest' locations (such as Frankfurt and Amsterdam) were immediately limited, and users faced Internet access issues. Due to this mistake, only part of the VPN server addresses were included in the allowed list. On November 22 at 9:14 UTC, a new version of the management service was deployed that contained an error. This list is formed by a management service that knows all the IP addresses of all the VPN servers. AdGuard DNS servers periodically request an updated list of IP addresses for which the rate limit should be disabled. To work around this problem, we remove the rate limit for VPN servers. ![]() The rate limit is quite low, and some popular AdGuard VPN locations generate more requests than allowed. This is a standard tactic to prevent DNS amplification (i.e., using a public DNS server to perform DDOS attacks on a third party). By using a popular public DNS server (such as AdGuard DNS), you are sharing the same server as tens or hundreds of millions of other Internet users.ĪdGuard DNS employs rate limiting to restrict the number of requests a user can send to the DNS server. We believe this is not the best tactic, and matching your IP address with your DNS server's address can be a signal of using a VPN. Normally, VPN services use the same VPN server as your DNS server. Why do we do this? The goal is to make you 'less noticeable' among Internet users. ![]() It's always DNSīy default, AdGuard VPN users use AdGuard DNS Non-Filtering as their DNS server. We apologize for this outage and would like to provide more information about its causes and the steps we are taking to prevent such issues in the future. Primarily affected were users in locations such as Frankfurt, Amsterdam, London, and Dallas. On November 22, 2023, there was a disruption in the AdGuard VPN service that may have caused Internet access issues for a significant number of users. ![]()
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