In this post I just show what domains you need to enable to authorize access to  telegram and whatsapp web sites behind your corporate proxy. This is useful when you need to allow – like me – just a subset of your users to access it.

Allow following Telegram domains on your proxy

• web.telegram.org
• vesta.web.telegram.org
• telegram.me

Allow following WhatsApp domains on your proxy

• web.whatsapp.com
• dyn.web.whatsapp.com
• w[0-9].web.whatsapp.com (from w0 to w9)
• pps.whatsapp.net
• mms.whatsapp.net
• mmg-fna.whatsapp.net