Telegram said that its services have been restored after reports of malfunctions.
Earlier in the day, nearly 30,000 users reported difficulties getting access to the platform.
According to a map posted by Downdetector, problems getting access to Telegram have been reported in Russia, Europe and some parts of the Middle East.
Telegram is a cross-platform cloud-based instant messaging, video calling, and VoIP service launched in Russia in 2013.
Downdetector is a website which monitors crashes and outages on popular online resources.