Nexus RemoteStorageException

Nexus RemoteStorageException

Short question. Any ideas on the following stack trace in nexus logs? I
could probably find a solution myself, if I even understand what the error
was :)
ERROR [p21752992-57395] -
org.sonatype.nexus.proxy.maven.maven2.M2Repository - Got
RemoteStorageException in proxy repository "Maven Public Dependencies"
[id=mavenpublicdependencies] while retrieving remote artifact
"ResourceStoreRequest(requestPath="/org/apache/maven/surefire/surefire-junit4/2.16/surefire-junit4-2.16.pom")"
from URL groups:public/, this is 1 (re)try, cause:
org.sonatype.nexus.proxy.AccessDeniedException: Access denied on
repository ID='public',
path='/org/apache/maven/surefire/surefire-junit4/2.16/surefire-junit4-2.16.pom',
action='read'!