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Cisco Bug: CSCub08310 - ASA "write standby" fails with "Failed to initialize interface" error

Last Modified

Feb 17, 2018

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases


Description (partial)


"write standby" command may fail to synchronize configuration from active ASA to standby ASA. The following error messages may be printed on the standby unit:

Beginning configuration replication from mate.
ERROR: open(np/port/ec/40/10/23/24/25/26/-1/-1/-1/-1/-1/-1/-1/-1/-1/-1/-1/-1) failed.
ERROR: open(Po11) failed.
ERROR: Failed to initialize interface inside
ERROR: Add interface failed.

if "debug fover fail" is enabled. This causes all "nameif" commands being lost from context configuration and standby configuration becomes unsynchronized with active:

Number of interfaces on Active and Standby are not consistent.
If the problem persists, you should disable and re-enable failover 
on the Standby.


ASA 8.4(3.9). Exact conditions are not known yet.
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