Puppet may fail if setting values appear to be numerics

/etc/puppetlabs/puppet/puppet.conf
certname = 000000000180
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Error: Could not parse /etc/puppetlabs/puppet/puppet.conf: invalid value for Integer(): "000000000180"
Error: Could not request certificate: Failed to open TCP connection to puppet:8140 (getaddrinfo: Name
or service not known)
Exiting; failed to retrieve certificate and waitforcert is disabled
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certname in quotations makes puppet agent run but then an error on the server side is thrown:
Error: Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: invalid value for Integer(): "000000000180"