What Is TikTok Signing?
TikTok requires connection requests to its live chat feed to be cryptographically signed. The desktop app signs these requests through a third-party signing service run by Euler Stream. No account or API key is needed for normal use — the app uses Euler's free tier automatically.
Because this service sits between the app and TikTok, TikTok sources can stop working even when nothing is wrong on your end: the sign server may be down, rate-limited, or temporarily broken by a TikTok-side change.
"Sign Server Unavailable"
This status means the app could not get a valid signature from the signing service. Common causes:
- Rate limits. The free tier is limited per IP address (a few connections per minute, with hourly and daily caps — see Euler's rate limits). Repeatedly deleting and re-adding the source, or rapidly switching modes, burns through the quota and keeps the error going.
- Sign server outage. Euler is occasionally down or overloaded. This usually resolves within hours and needs no changes on your side.
- TikTok changes. When TikTok updates its live infrastructure, signing can break for everyone until Euler ships a fix.
What to do, in order:
- Leave the source connected on Auto and let it retry on its own. Avoid re-adding the source over and over.
- If it has failed repeatedly, stop for an hour so the per-IP rate limit resets, then reconnect once.
- Make sure you are on the latest app version — TikTok fixes ship frequently.
- Switch the TikTok source to Standard mode (page capture) as a reliable stopgap. It loads the live page directly and does not use the sign server at all.
- If you hit rate limits often, add your own free Euler API key (below).
Add Your Own Euler API Key
Your own key gives you a dedicated quota instead of sharing the anonymous per-IP allowance.
- Create a free account and key at the Euler Stream dashboard.
- In the desktop app, edit your TikTok source and open the connection preset picker.
- Choose Euler Signing (Advanced) and paste your API key. Euler Proxy (API Key) also works but does not support sending replies.
- Reconnect the source once after saving.
Modes That Avoid the Sign Server
| Mode | How It Works | Trade-offs |
|---|---|---|
| Standard | Loads the TikTok live page and captures chat from it. No signing service involved. | Needs the live page to stay open; may prompt for TikTok login or verification. |
| Local Signer | Signs requests locally in a lightweight TikTok window instead of using Euler. | Works best signed into TikTok inside the app; anonymous mode can miss some chat. |
Auto and Polling both rely on the Euler service, so they share its outages and limits.
Sending Replies To TikTok
Sending chat messages from the dock back to TikTok requires being signed into your TikTok account inside the desktop app — the app needs your TikTok session to post as you. If you are not signed in, or the TikTok connection is down, outgoing messages will only reach your other platforms.
Note that Euler Proxy mode never supports replies, regardless of sign-in state.