Ably FAQs

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Ably FAQs

Ably architecture, transports, and security

Ably architecture, transports, and security

Details on how Ably works and what makes us reliable and secure

Transports and connections

Which transports are supported?

Do you support multiplexing and channel groups?

Connection state recovery

Why is the Realtime SDK always establishing Comet connections for long polling rather than using it as a fallback for WebSockets?

Security

When I change a key's capabilities in the dashboard, will existing connections get those capabilities immediately?

Using capabilities to manage client access privileges on channels

Token and Basic authentication

"The security certificate has been revoked" error connecting to Ably

Recommendations for incrementally authorising new capabilities

Is it secure to send the access_token as part of the websocket url query params?

If I need to whitelist Ably's servers from a firewall, which ports, IPs and/or domains should I add?

How can you restrict which channels a client can access?

For compliance reasons, I need to know how long will Ably store my data for

DOS attack prevention

Do you support certificate and/or public key pinning for TLS connections?

Cross-platform symmetric encryption offered by the libraries

Can a client emulate any client ID i.e. authenticate using a wildcard client ID?

Authenticated and identified clients

Are messages sent to and received from Ably securely using TLS?

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Protocol support and protocol adapters

Using the Ably Pusher protocol adapter

What are Ably protocol adapters and how do they work?

Do you support SSE?

Using the MQTT protocol adapter

Using the Ably Pubnub protocol adaptor

Why would I use MQTT over Ably's realtime protocol?

Do you support the PubNub protocol?

Do you support MQTT? Are you protocol agnostic?

Can you help ease the pain of migration from another Data Stream Network?

What QoS levels does the MQTT adapter support, and why?

Why would I use SSE over Ably's realtime protocol?

Do you support the Pusher protocol?

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Data centres

Where are Ably's servers and datacenters located around the world?

Ably architecture design

How do I avoid hitting the Max Channel Message Rate Limit?

How is Ably different from Amazon SNS?

Why does Ably have concurrent channel limits?