U.S. internet infrastructure company Cloudflare said on Friday it had issued a fix for an issue with its dashboard and related apps.

Shares of the company fell as much as 4.5% in premarket trading after global websites went down and Cloudflare said it was investigating.

The company issued an update minutes later saying it had “implemented a fix” and was watching for results. Cloudflare shares pared some of its losses on the news and were last seen 2% lower.

Sites including professional networking platform LinkedIn, digital currency exchange Coinbase and online publishing platform Substack were among those that appeared to be impacted by the issue.

Outage monitoring site Downdetector, which itself appeared to be briefly impacted, said users reported a sharp uptick in problems on sites, including e-commerce platform Shopify, HSBC and food delivery group Deliveroo, among others, at around 9:16 a.m. London time.

These reports fell as Cloudflare implemented its fix shortly thereafter.

The outage comes less than three weeks after a similar Cloudflare crash caused error messages across the internet, an issue that the company said was “unacceptable” at the time, given the importance of its services.

Cloudflare’s software is used by many businesses worldwide, helping to manage and secure traffic for about 20% of the web. Among the services it provides are that it guards against distributed denial of service attacks, which are when malicious actors attempt to overload a website’s system with so many traffic requests that it can’t function.

— CNBC’s Annie Palmer contributed to this report.