"Obsolete encryption cipher detected." Your seller is using RC4 or DES. These ciphers were broken years ago. Your modern device may refuse to connect.
Here's a contrarian observation: encryption ciphers have lifespans. A British IPTV reseller who updates their ciphers uses AES-128 or AES-256. A lazy seller uses old ciphers "because they work." A dangerous seller doesn't understand cipher obsolescence.
In most cases, a good seller's ciphers are modern (AES). A bad seller's ciphers are obsolete. A terrible seller's ciphers are from the 1990s.
What actually works is asking: "What encryption ciphers do you support?" A good IPTV reseller UK says "AES-128/256." A bad seller says "strong encryption" — which is meaningless.
Let me give you a real example. A user's British IPTV stopped working after a security update. The seller was using RC4. Modern devices dropped RC4 support. The seller refused to upgrade.
Most operators find that AES is the standard. Anything else is insecure or obsolete.