ufw我尝试在远程 Ubuntu 14.04 服务器上进行设置，因此我安装了它并允许ssh使用命令
sudo ufw allow ssh
之后我尝试启用ufw但出现以下错误：
ERROR: problem running ufw-init
iptables-restore: line 77 failed
iptables-restore: line 30 failed
iptables-restore: line 10 failed
iptables-restore: line 39 failed
iptables-restore v1.4.21: Couldn't load target `ufw-user-input':No such file or directory
Error occurred at line: 2
Try `iptables-restore -h' or 'iptables-restore --help' for more information.
Problem running '/etc/ufw/before.rules'
Problem running '/etc/ufw/after.rules'
Problem running '/lib/ufw/user.rules'
然后我发现这故障排除指南建议注释上述 .rules 文件中的某些行，但我必须注释所有文件中的每一行才能启动它。我不能这样做，因为我至少需要允许规则ssh。
最可疑的一行是提到iptables-restore错误的一行：
iptables-restore v1.4.21: Couldn't load target `ufw-user-input':No such file or directory
Error occurred at line: 2
Try `iptables-restore -h' or 'iptables-restore --help' for more information.
错误中提到的 .rules 文件现在如下：
之前规则：
# rules.before
#
# Rules that should be run before the ufw command line added rules. Custom
# rules should be added to one of these chains:
# ufw-before-input
# ufw-before-output
# ufw-before-forward
#
# Don't delete these required lines, otherwise there will be errors
*filter
:ufw-before-input - [0:0]
:ufw-before-output - [0:0]
:ufw-before-forward - [0:0]
:ufw-not-local - [0:0]
# End required lines
# allow all on loopback
-A ufw-before-input -i lo -j ACCEPT
-A ufw-before-output -o lo -j ACCEPT
# quickly process packets for which we already have a connection
-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
# drop INVALID packets (logs these in loglevel medium and higher)
-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
# ok icmp codes for INPUT
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
# ok icmp code for FORWARD
-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT
# allow dhcp client to work
-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
#
# ufw-not-local
#
-A ufw-before-input -j ufw-not-local
# if LOCAL, RETURN
#-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
# if MULTICAST, RETURN
#-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
# if BROADCAST, RETURN
#-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
# all other non-local packets are dropped
-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
-A ufw-not-local -j DROP
# allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above
# is uncommented)
#-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
# allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above
# is uncommented)
#-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
# don't delete the 'COMMIT' line or these rules won't be processed
COMMIT
之后规则：
# rules.input-after
#
# Rules that should be run after the ufw command line added rules. Custom
# rules should be added to one of these chains:
# ufw-after-input
# ufw-after-output
# ufw-after-forward
#
# Don't delete these required lines, otherwise there will be errors
*filter
:ufw-after-input - [0:0]
:ufw-after-output - [0:0]
:ufw-after-forward - [0:0]
# End required lines
# don't log noisy services by default
-A ufw-after-input -p udp --dport 137 -j ufw-skip-to-policy-input
-A ufw-after-input -p udp --dport 138 -j ufw-skip-to-policy-input
-A ufw-after-input -p tcp --dport 139 -j ufw-skip-to-policy-input
-A ufw-after-input -p tcp --dport 445 -j ufw-skip-to-policy-input
-A ufw-after-input -p udp --dport 67 -j ufw-skip-to-policy-input
-A ufw-after-input -p udp --dport 68 -j ufw-skip-to-policy-input
# don't log noisy broadcast
#-A ufw-after-input -m addrtype --dst-type BROADCAST -j ufw-skip-to-policy-input
# don't delete the 'COMMIT' line or these rules won't be processed
COMMIT
用户规则：
*filter
:ufw-user-input - [0:0]
:ufw-user-output - [0:0]
:ufw-user-forward - [0:0]
:ufw-before-logging-input - [0:0]
:ufw-before-logging-output - [0:0]
:ufw-before-logging-forward - [0:0]
:ufw-user-logging-input - [0:0]
:ufw-user-logging-output - [0:0]
:ufw-user-logging-forward - [0:0]
:ufw-after-logging-input - [0:0]
:ufw-after-logging-output - [0:0]
:ufw-after-logging-forward - [0:0]
:ufw-logging-deny - [0:0]
:ufw-logging-allow - [0:0]
:ufw-user-limit - [0:0]
:ufw-user-limit-accept - [0:0]
### RULES ###
### tuple ### allow any 22 0.0.0.0/0 any 0.0.0.0/0 in
-A ufw-user-input -p tcp --dport 22 -j ACCEPT
-A ufw-user-input -p udp --dport 22 -j ACCEPT
### END RULES ###
### LOGGING ###
-A ufw-after-logging-input -j LOG --log-prefix "[UFW BLOCK] " -m limit --limit 3/min --limit-burst 10
-A ufw-after-logging-forward -j LOG --log-prefix "[UFW BLOCK] " -m limit --limit 3/min --limit-burst 10
-I ufw-logging-deny -m conntrack --ctstate INVALID -j RETURN -m limit --limit 3/min --limit-burst 10
-A ufw-logging-deny -j LOG --log-prefix "[UFW BLOCK] " -m limit --limit 3/min --limit-burst 10
-A ufw-logging-allow -j LOG --log-prefix "[UFW ALLOW] " -m limit --limit 3/min --limit-burst 10
### END LOGGING ###
### RATE LIMITING ###
-A ufw-user-limit -m limit --limit 3/minute -j LOG --log-prefix "[UFW LIMIT BLOCK] "
-A ufw-user-limit -j REJECT
-A ufw-user-limit-accept -j ACCEPT
### END RATE LIMITING ###
COMMIT
有没有人遇到过类似的问题并解决了，或者知道如何解决这些问题？
提前致谢。
答案1
有一个/usr/share/ufw/check-requirements脚本可以检查ufw运行所需的一切。您将获得有关缺少什么的提示。
ufwiptables/netfilter如果不完整构建内核或加载模块，则无法工作。如果您无法构建新内核，那么您将遇到麻烦。
您链接的帖子试图解决这些问题。他们还说 ufw 应用程序脚本仍然不起作用。您可以尝试使用端口 22 而不是ssh。