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无法访问本地主机（High Sierra）

tag-icon • tag-icon networking ping localhost network-interface macos-highsierra
无法访问本地主机（High Sierra）

今天早些时候，我的 MBP 在强制重启（崩溃）后开始遇到运行 High Sierra 的困难。我的问题基本上归结为：

  • 重启后，我无法与 lo0 接口（localhost、127.0.0.1、::1）上的任何内容建立连接。除 之外的所有请求都ping将无限期挂起和/或超时。http、tcp、traceroute 等都会发生这种情况。

  • 在安全模式下启动时，问题不会发生，我能够在 localhost 和 127.0.0.1 上启动一个简单的 http 服务器和 curl / wget。我已重新启动到正常模式并禁用了我的用户的所有登录项，但问题仍然存在。防火墙已禁用。

知道发生了什么吗？我现在很困惑。

127.0.0.1 可路由

sw14111@OF060VL39VHTD6D:~$ scutil -r 127.0.0.1
Reachable,Local Address,Directly Reachable Address

Ping 工作正常

sw14111@OF060VL39VHTD6D:~$ ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.063 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.047 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.117 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.073 ms

卷曲失败示例

sw14111@OF060VL39VHTD6D:~$ curl -v -x "" localhost:8000
* Rebuilt URL to: localhost:8000/
*   Trying ::1...
* TCP_NODELAY set
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 8000 failed: Operation timed out
*   Trying fe80::1...
* TCP_NODELAY set
* Connection failed
* connect to 127.0.0.1 port 8000 failed: Operation timed out
* Connection failed
* connect to fe80::1 port 8000 failed: Operation timed out
* Failed to connect to localhost port 8000: Operation timed out
* Closing connection 0
curl: (7) Failed to connect to localhost port 8000: Operation timed out

跟踪路由超时

traceroute to 127.0.0.1 (127.0.0.1), 64 hops max, 52 byte packets
 1  * * *
 2  * * *
 3  * * *

SYN_SENT当请求正在进行时总是停留在状态。

sw14111@OF060VL39VHTD6D:~$ netstat -an | grep 127.0.0.1
tcp4       0      0  127.0.0.1.49679        127.0.0.1.8000         SYN_SENT

/etc/hosts

##
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1    localhost
255.255.255.255    broadcasthost
::1 localhost
fe80::1%lo0    localhost

lo0界面

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
    options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
    inet 127.0.0.1 netmask 0xff000000
    inet6 ::1 prefixlen 128
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
    nd6 options=201<PERFORMNUD,DAD>

lsof简单服务器的输出

sw14111@OF060VL39VHTD6D:~$ python -m SimpleHTTPServer 18080
Serving HTTP on 0.0.0.0 port 18080 ...

# another terminal
sw14111@OF060VL39VHTD6D:~$ sudo lsof -a  -i -sTCP:LISTEN
Python    2245        sw14111    3u  IPv4 0x8d80c2958887276d      0t0    TCP *:18080 (LISTEN)

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