"Algorithm negotiation fail" when capturing configurations using Spectrum NCM
Article ID: 367994
Updated On:
Products
Issue/Introduction
"Algorithm negotiation fail" error is seen in the events tab after a capture failure.
Specific error: Algorithm negotiation fail:
algorithmName="mac.c2s"
jschProposal="hmac-md5,hmac-md5-96,hmac-sha1,hmac-sha1"
serverProposal="hmac-sha2-256"
Environment
Supported versions of DX NetOps Spectrum
Cause
Mismatch in algorithm between the device and the jsch client in NCM
Resolution
We can update the ciphers and jsch-macs.
In the case of the above error, only the macs need to be updated:
Edit the $SPECROOT/NCM/config.xml file and find:
<jsch-macs type="java.lang.String">hmac-md5,hmac-md5-96,hmac-sha1,hmac-sha1-96</jsch-macs>
Change to:
<jsch-macs type="java.lang.String">hmac-md5,hmac-md5-96,hmac-sha1,hmac-sha1-96,hmac-sha2-256</jsch-macs>
Save the file and kill the ncmservice to restart it automatically.
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