We get occasional mismatched HMAC signatures coming back from messages in the IPyKernel.
No clear pattern on type of message
No clear pattern on messages received on a channel
For a given key, several messages will work but then one will fail. Doesn't appear to be an issue with wrong/incorrect signing key
Have not experienced this with IRKernel in similar testing (however, do not believe this has anything to do with IPyKernel, just that it replicates in that kernel)
We get occasional mismatched HMAC signatures coming back from messages in the IPyKernel.