# JSERVICES_SYN_DEFENSE

## Canonical Reference

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

**Canonical URL:**  
https://apps.juniper.net/syslog-explorer/?msg=JSERVICES_SYN_DEFENSE

## SYSLOG Details
- **Message**: 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**: TCP handshake timed out for session
- **Description**: The packet with the indicated characteristics was discarded, because the Transmission Control Protocol (TCP) handshake that is used to establish a session did not complete within the set time limit. The time limit is set by the 'open-timeout' statement at the [edit interfaces &lt;services-interface> services-options] hierarchy level. If the time limit is not set, the session uses the default timeout value.
- **Type**: Event: This message reports an event, not an error
- **Severity**: notice
- **Cause**: -
- **Action**: None
- **Attributes**: protocol-id
protocol-name
source-interface-name
separator
source-address
source-port
destination-address
destination-port
event-type
- **Facility**: ANY

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