coturn启动后通过ICE servers测试，报如下错误
The server turn:192.168.1.188:3478?transport=udp returned an error with code=508:
我是在自己电脑安装的oracle vm虚拟机Ubuntu的系统，网络链接方式为桥接，从虚拟机中ping百度和本机都通，但是通过ICE servers测试外网不通
turnserver.conf
listening-port=3478
tls-listening-port=5349
listening-ip=192.168.1.188
relay-device=enp0s3
relay-ip=192.168.1.60
external-ip=外网ip
min-port=49152
max-port=65535
fingerprint
lt-cred-mech
user=cdsoft:root
realm=shandong
cli-password=123456
cert=/etc/turn_server_cert.pem
pkey=/etc/turn_server_pkey.pem
