Maintaining a stable session is crucial when accessing Cloudflare-protected websites. Many users assume that as long as the sessionId remains the same, their IP address will also stay consistent. However, this is not always the case—especially when using a proxy gateway with load balancing based on client location.
This article explains why identical session IDs may lead to different IP addresses, how Cloudflare handles IP consistency during challenges, and the correct configuration to ensure Cloudflare cookies remain valid.
Why Does the Same Session ID Produce Different IPs?
Some proxy providers operate multiple gateway regions (e.g., US, EU, APAC) and use dynamic routing to allocate traffic based on the client's geographical location. This means:
- The same session ID may be routed to different regional gateways
- Each gateway maintains independent caching and session storage
- The resulting public exit IP can vary, depending on where the request originates
A Typical Scenario
Consider a real-world Cloudflare challenge flow:
A user in Germany is developing locally and needs to solve Cloudflare’s 5-second security challenge (cf_challenge). To automate this, they use a third-party challenge solver — Capsolver — to obtain Cloudflare cookies.
In this setup:
- Capsolver infrastructure is located in the United States
- The user’s development environment is in Germany
- Both parties connect through
gate.nstproxy.iowith the same sessionId
Expected Behavior
The user assumes:
“If the sessionId and gateway name are identical, Cloudflare should treat both requests as from the same source.”
