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

## SYSLOG Details
- **Message**: <variable>interface-name</variable>: received invalid operation code <variable>operation</variable> (type <variable>operation-code</variable>, CHAP ID <variable>message-id</variable>)
- **Help**: Operation code was invalid
- **Description**: The Point-to-Point Protocol process (pppd) received a Challenge Handshake Authentication Protocol (CHAP) message that included the indicated operation code, which is invalid.
- **Type**: Error: An error occurred
- **Severity**: error
- **Cause**: -
- **Action**: -
- **Attributes**: interface-name
operation
operation-code
message-id
- **Facility**: LOG_AUTH

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