Solr 8.4 Master - Slave

After the Master - Slave configuration for Solr 8.4 I got Invalid Master on the Solr admin web, then I checked the logs and found this error:

"Expected mime type application/octet-stream but got text/html"

The problem was the # character in the slave's settings, after I removed #  the replication works fine.

 Dashboard Solr admin: