---
title: Understanding TCP Meltdown in Access Server
canonical: https://openvpn.net/as-docs/faq-tcp-meltdown/
product: Access Server Docs
---

# Understanding TCP Meltdown in Access Server

**Question:** What is TCP meltdown?

**Answer:**

TCP Meltdown occurs when TCP traffic is tunneled over TCP, causing performance issues due to overcompensating retransmissions. Use UDP for the tunnel to avoid this issue.

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Prev: [Check Linux IP Forwarding for Access Server Routing](https://openvpn.net/as-docs/faq-ip-forwarding-on-linux.md)
Next: [Why Does Access Server Use UDP and TCP?](https://openvpn.net/as-docs/faq-udp-and-tcp.md)
Index: https://openvpn.net/as-docs/llms.txt