diff --git a/src/service.cr b/src/service.cr
index b2d3a46..9c33660 100644
--- a/src/service.cr
+++ b/src/service.cr
@@ -111,7 +111,7 @@ class AuthD::Service < IPC
 		File.write @last_uid_file, uid.to_s
 	end
 
-	def get_logged_user?(fd : Int32)
+	def get_logged_user?(fd : Int32) : AuthD::User::Public?
 		@logged_users[fd]?
 	end
 
@@ -123,6 +123,17 @@ class AuthD::Service < IPC
 		end
 	end
 
+	# `log_user_info` provides a string composed from either the user
+	# id in case the user was authenticated or the file descriptor of
+	# the connection.
+	def log_user_info(fd : Int32) : String
+		if user = get_logged_user? fd
+			"userid #{user.uid}"
+		else
+			"fd #{"%4d" % fd}"
+		end
+	end
+
 	def user?(uid_or_login : UserID)
 		if uid_or_login.is_a? UInt32
 			@users_per_uid.get? uid_or_login.to_s
@@ -144,20 +155,21 @@ class AuthD::Service < IPC
 		end
 
 		request_name = request.class.name.sub /^AuthD::Request::/, ""
+		connection_info_str = log_user_info event.fd
 
 		response = begin
 			request.handle self, event.fd
 		rescue e : UserNotFound
-			Baguette::Log.error "(fd #{ "%4d" % event.fd}) #{request} user not found"
+			Baguette::Log.error "(#{connection_info_str}) #{request} user not found"
 			AuthD::Response::Error.new "authorization error"
 		rescue e : AuthenticationInfoLacking
-			Baguette::Log.error "(fd #{ "%4d" % event.fd}) #{request} lacking authentication info"
+			Baguette::Log.error "(#{connection_info_str}) #{request} lacking authentication info"
 			AuthD::Response::Error.new "authorization error"
 		rescue e : AdminAuthorizationException
-			Baguette::Log.error "(fd #{ "%4d" % event.fd}) #{request} admin authentication failed"
+			Baguette::Log.error "(#{connection_info_str}) #{request} admin authentication failed"
 			AuthD::Response::Error.new "authorization error"
 		rescue e
-			Baguette::Log.error "(fd #{ "%4d" % event.fd}) #{request} generic error #{e}"
+			Baguette::Log.error "(#{connection_info_str}) #{request} generic error #{e}"
 			AuthD::Response::Error.new "unknown error"
 		end
 
@@ -170,10 +182,10 @@ class AuthD::Service < IPC
 		duration = Time.utc - request_start
 
 		if response.is_a? AuthD::Response::Error
-			Baguette::Log.warning "fd #{ "%4d" % event.fd} (#{duration}) #{request} >> #{response}"
+			Baguette::Log.warning "(#{connection_info_str}) (#{duration}) #{request} >> #{response}"
 		else
 			if request_name != "KeepAlive" || should_display? AUTHMESSAGE::KEEPALIVE
-				Baguette::Log.debug "fd #{ "%4d" % event.fd} (#{duration}) #{request} >> #{response}"
+				Baguette::Log.debug "(#{connection_info_str}) (#{duration}) #{request} >> #{response}"
 			end
 		end
 	end