Bug ID 949477: NTLM RPC exception: Failed to verify checksum of the packet

Last Modified: Apr 14, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP APM(all modules)

Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1

Opened: Sep 29, 2020
Severity: 3-Major

Symptoms

NTLM authentication fails with the error: RPC exception: Failed to verify checksum of the packet.

Impact

User authentication fails.

Conditions

-- Start nlad process with 'encryption'. -- Configure a user, and map that user to a huge number of groups. -- Configure NTLM front-end authentication.

Workaround

1. Run the 'nlad' process with '-encrypt no' in the file /etc/bigstart/startup/nlad. 2. Disable encryption for nlad: # vim /etc/bigstart/startup/nlad change: exec /usr/bin/${service} -use-log-tag 01620000 to: exec /usr/bin/${service} -use-log-tag 01620000 -encrypt no 3. Restart nlad to make the change effective, and to force the schannel to be re-established: # bigstart restart nlad

Fix Information

None

Behavior Change