diff --git a/lib/puppet/provider/mongodb.rb b/lib/puppet/provider/mongodb.rb
index 1e69d42ec..5f5c7cebb 100644
--- a/lib/puppet/provider/mongodb.rb
+++ b/lib/puppet/provider/mongodb.rb
@@ -132,9 +132,19 @@ def self.conn_string
 
   def self.db_ismaster
     cmd_ismaster = 'db.isMaster().ismaster'
-    cmd_ismaster = mongorc_file + cmd_ismaster if mongorc_file
     db = 'admin'
-    res = mongo_cmd(db, conn_string, cmd_ismaster).to_s.chomp
+
+    full_command = if mongorc_file
+                     mongorc_file + cmd_ismaster
+                   else
+                     cmd_ismaster
+                   end
+    res = mongo_cmd(db, conn_string, full_command).to_s.chomp
+
+    # Retry command without authentication when mongorc_file is set and authentication failed
+    if mongorc_file && res =~ %r{Authentication failed}
+      res = mongo_cmd(db, conn_string, cmd_ismaster).to_s.chomp
+    end
     res.eql?('true') ? true : false
   end
 
diff --git a/lib/puppet/provider/mongodb_database/mongodb.rb b/lib/puppet/provider/mongodb_database/mongodb.rb
index 8be330779..238f6158d 100644
--- a/lib/puppet/provider/mongodb_database/mongodb.rb
+++ b/lib/puppet/provider/mongodb_database/mongodb.rb
@@ -12,6 +12,9 @@ def self.instances
       new(name: db['name'],
           ensure: :present)
     end
+  rescue => e
+    Puppet.warning("Getting instances of mongodb_database failed: #{e}")
+    []
   end
 
   # Assign prefetched dbs based on name.
diff --git a/lib/puppet/provider/mongodb_user/mongodb.rb b/lib/puppet/provider/mongodb_user/mongodb.rb
index 1309375b7..5e9c5747a 100644
--- a/lib/puppet/provider/mongodb_user/mongodb.rb
+++ b/lib/puppet/provider/mongodb_user/mongodb.rb
@@ -27,16 +27,21 @@ def self.instances
         end
         return allusers
       else
-        users = JSON.parse mongo_eval('printjson(db.system.users.find().toArray())')
-
-        users.map do |user|
-          new(name: user['_id'],
-              ensure: :present,
-              username: user['user'],
-              database: user['db'],
-              roles: from_roles(user['roles'], user['db']),
-              password_hash: user['credentials']['MONGODB-CR'],
-              scram_credentials: user['credentials']['SCRAM-SHA-1'])
+        begin
+          users = JSON.parse mongo_eval('printjson(db.system.users.find().toArray())')
+
+          users.map do |user|
+            new(name: user['_id'],
+                ensure: :present,
+                username: user['user'],
+                database: user['db'],
+                roles: from_roles(user['roles'], user['db']),
+                password_hash: user['credentials']['MONGODB-CR'],
+                scram_credentials: user['credentials']['SCRAM-SHA-1'])
+          end
+        rescue => e
+          Puppet.warning "Could not get instances for mongodb_database: #{e}"
+          []
         end
       end
     else
@@ -84,7 +89,7 @@ def create
 	  "roles": #{@resource[:roles].to_json},
 	  "digestPassword": false
 	}
-	EOS
+        EOS
 
         mongo_eval("db.runCommand(#{cmd_json})", @resource[:database])
       end
@@ -155,7 +160,7 @@ def roles=(roles)
       else
         grant = roles - @property_hash[:roles]
         unless grant.empty?
-          mongo_eval("db.getSiblingDB('#{@resource[:database]}').grantRolesToUser('#{@resource[:username]}', #{grant. to_json})")
+          mongo_eval("db.getSiblingDB('#{@resource[:database]}').grantRolesToUser('#{@resource[:username]}', #{grant.to_json})")
         end
 
         revoke = @property_hash[:roles] - roles