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After upgrading, mcpd goes into a restart loop. /var/log/ltm contains the following: err mcpd[13691]: 0107102b:3: Master Key decrypt failure - decrypt failure - final notice mcpd[13691]: 01071029:5: Master decrypt final notice mcpd[13691]: 01071027:5: Master key OpenSSL error: 4006860532:error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length:evp_enc.c:653: notice mcpd[13691]: 01b00001:5: Processed value is empty: class name (usmuser) field name () err mcpd[13691]: 01071684:3: Unable to encrypt application variable (/Common/snmpv3user auth_password usmuser /Common/snmpd).
- SNMP configuration does not function. - If the device is rebooted or MCPD is restarted, the system will remain INOPERATIVE or MCPD will be in a restart loop.
-- SNMPv3 configuration that uses a password containing more than 77 characters -- An upgrade is performed This also occurs within a release by saving the config and then forcing a load from text files (`touch /service/mcpd/forceload && pkill mcpd`) This may also occur with auth-password or privacy-password values that are 78 characters in length or longer
If a device is currently in an inoperative state and affected by this issue: - Create a backup copy of /config/bigip_base.conf - Manually edit bigip_base.conf and remove the SNMPv3 users and traps - If the system does not recover automatically, restart MCPD or reboot the device once.
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