Running a pipeline build runs successfully.  However in the console output I receive multiple lines in a row saying:
Cannot contact <slave>: java.io.IOException: Remote call on <slave> failed
Cannot contact <slave>: java.io.IOException: Remote call on <slave> failed
Cannot contact <slave>: java.io.IOException: Remote call on <slave> failed
Cannot contact <slave>: java.io.IOException: Remote call on <slave> failed

Until it eventually does connect and continues with the build steps.  This output seems to occur more than once throughout the build (roughly 4 times for this particular job).  The job ends up finishing successfully so this output doesn't seem to affect the build process.