# Xxxxx circuits rejected

**URL:** https://forum.torproject.org/t/xxxxx-circuits-rejected/12864
**Category:** Relay Operator
**Created:** [May 25, 2024, 8:15pm UTC](https://forum.torproject.org/t/xxxxx-circuits-rejected/12864 "2024-05-25T20:15:03Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![lit144](https://forum.torproject.org/letter_avatar_proxy/v4/letter/l/97f17d/32.png) [@lit144](https://forum.torproject.org/u/lit144)
#### Post date: [May 25, 2024, 8:15pm UTC](https://forum.torproject.org/t/xxxxx-circuits-rejected/12864/1 "2024-05-25T20:15:03Z")

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Hey,

I am running a tor relay since 1 1/2 days now.

I am monitoring the relay with nyx and i get this message from time to time:  
“”"  
Heartbeat: DoS mitigation since startup: 0 circuits killed with too many cells, 90331 circuits rejected, 1 marked addresses, 0 marked  
addresses for max queue, 8 same address concurrent connections rejected, 25 connections rejected, 0 single hop clients refused, 0 INTRODUCE2 rejected.  
“”"

Why do I reject so much circuits? I currently have only 7 active circuits and I think this is normal because of the life cycle of new relays. But what does the number 90331 circuits mean? How that does that happen?

Thanks in advance

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### Author: ![NoOp21](https://forum.torproject.org/letter_avatar_proxy/v4/letter/n/6a8cbe/32.png) [@NoOp21](https://forum.torproject.org/u/NoOp21)
#### Post date: [June 11, 2024, 12:05pm UTC](https://forum.torproject.org/t/xxxxx-circuits-rejected/12864/2 "2024-06-11T12:05:58Z")

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That’s not the fault of your relay and it’s called the [Denial of Service Mitigation Subsystem](https://gitlab.torproject.org/tpo/core/tor/-/issues/24902).  
It can reach high numbers during attacks so nothing to worry about and not the fault of your relay.

[https://spec.torproject.org/dos-spec/overview.html#protocol-resources](https://spec.torproject.org/dos-spec/overview.html#protocol-resources)  
[https://man.archlinux.org/man/tor.1.en#DENIAL\_OF\_SERVICE\_MITIGATION\_OPTIONS](https://man.archlinux.org/man/tor.1.en#DENIAL_OF_SERVICE_MITIGATION_OPTIONS)

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### Author: ![system](https://forum.torproject.org/uploads/default/original/2X/d/d3424bed34f4ec18b2e99178c2801ba6dfb655d6.png) [@system](https://forum.torproject.org/u/system)
#### Post date: [June 13, 2024, 8:27pm UTC](https://forum.torproject.org/t/xxxxx-circuits-rejected/12864/3 "2024-06-13T20:27:18Z")

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