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FAQ: Why Does an AC Fail to Log In to a Fit AP as an STelnet Client?
In V200R021C00 and later versions, the dh_group14_sha1 algorithm is not supported by default. When a Fit AP running V200R019C00 is managed, no matching algorithm is available, causing a failure to log in to the AP. In this case, you can run the module load weak-encrypt-algorithm command to load the weak-encryption-algorithm plug-in embedded in the system software package.