# [ASP_IDS_TCP_SYN_ATTACK](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK)

## SYSLOG Details
- **Message**: <variable>syslog-prefix</variable> <variable>error-code</variable>: proto <variable>protocol-id</variable> (<variable>protocol-name</variable>), <variable>source-interface-name</variable><variable>separator</variable><variable>source-address</variable>:<variable>source-port</variable> -> <variable>destination-address</variable><variable>destination-port</variable>, <variable>event-type</variable>
- **Help**: Stateful firewall received duplicate SYN packet
- **Description**: The stateful firewall received the packet with the indicated characteristics and determined that it was a duplicate Transmission Control Protocol (TCP) SYN packet (the SYN flag was set and a SYN packet was already received for the flow to the destination). The event was reported to intrusion detection services (IDS) and can cause IDS to activate SYN cookie protection. The packet contained the indicated information about its protocol (numerical identifier and name), source (logical interface name, IP address, and port number), and destination (IP address and port number).
- **Type**: Event: This message reports an event, not an error
- **Severity**: error
- **Cause**: -
- **Action**: -
- **Attributes**: syslog-prefix
error-code
protocol-id
protocol-name
source-interface-name
separator
source-address
source-port
destination-address
destination-port
event-type
- **Facility**: LOG_PFE

## Found this message in the following releases:
- [Junos OS 26.2R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=26.2R1)
- [Junos OS 25.4R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=25.4R1)
- [Junos OS 25.2R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=25.2R2)
- [Junos OS 25.2R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=25.2R1)
- [Junos OS 24.4R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=24.4R2)
- [Junos OS 24.4R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=24.4R1)
- [Junos OS 24.2R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=24.2R2)
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=23.4R2)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=23.4R1)
- [Junos OS 23.2R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=23.2R2)
- [Junos OS 23.2R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=23.2R1)
- [Junos OS 22.4R3](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=22.4R3)
- [Junos OS 22.4R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=22.4R2)
- [Junos OS 22.4R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=22.4R1)
- [Junos OS 22.2R3](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=22.2R3)
- [Junos OS 22.2R2](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=22.2R2)
- [Junos OS 22.2R1](https://apps.juniper.net/syslog-explorer/?msg=ASP_IDS_TCP_SYN_ATTACK&sw=Junos%20OS&rel=22.2R1)