A common complaint after entering a new KIS key: Telegram texts work, but calls fail. This is because Kaspersky’s firewall blocks UDP ports used by Telegram’s WebRTC.
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Sometimes, the local licensing file becomes corrupted, preventing the entry of a new, valid key. A common complaint after entering a new KIS
If your Kaspersky software is preventing the Telegram desktop app from connecting to its servers, follow these steps to "fix" the restriction: Add Telegram to Exclusions Open Kaspersky and go to Security Settings Exclusions and actions on objects detected Manage exclusions and add the Telegram executable file (usually Telegram.exe Web Anti-Virus Adjustment If Telegram web is blocked, go to Protection Web Anti-Virus Advanced Settings Configure trusted web addresses I can help you verify or fix your
Does it work? If yes – you are done. If no, proceed to Part 3.