Bypass Telegram App traffic for ssl decryption

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Bypass Telegram App traffic for ssl decryption

L4 Transporter


Is there any way to bypass the Telegram app traffic for SSLdecrypt? any idea?


L5 Sessionator

Firewalls are positive enforcement, meaning they will only do explicitly what you tell them to.


If you don't have a rule to decrypt telegram, it won't happen. 


If telegram is being picked up as a different app, you can create or modify existing App-IDs to get granular enough to exclude/include.


If you are a user on a corporate network that IS decrypting telegram, this isn't the place to talk about offensive sec and product bypassing 🙂

Help the community! Add tags and mark solutions please.

The SSL decrypt rule are based on categories. So no option to only no decrypt "telegram".

You have the ability to create custom categories (EDLs, static lists, etc)

Help the community! Add tags and mark solutions please.

L4 Transporter


SSL Decrypt is controlled via URL category and you can also use ports within the Decrypt policy, frankly I am shocked that Telegram does not use a pinned-cert, if it did it would be in the Decryption exclusion list Device > SSL Decryption Exclusion  however the best thing to do would be (in the absence of any useful info on the Telegram website) carry out a packet capture on the firewall and identify the traffic in question and more accurately check where the app is going URL wise.

A good starting point would be a custom URL category with Telegram added and then a do not decrypt policy above your broad decryption policy, however the packet capture would show the detail and this could also be added to the URL category.


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