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proftp 1.2.9的基本安装手册( 九 )

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daemon process.

23. 503 No PORT command issued

A bug was introduced in 1.2.0rc2 which prevented the PORT command working properly and therefore breaking the data socket

under certain conditions. The bug was documented as bug 240 and has been fixed in CVS. A rc3 release is due before the end of

Jan 2001.

24. Fatal: unable to determine IP address of

Proftpd was unable to work out what IP is associated with the hostname in the VirtualHost block. Normally caused by a problem

with the DNS resolution of the host, check the resolv.conf file and that your chosen nameservers are functional.

25. 451 append/restart not permitted, try again

AllowStoreRestart is disabled by default because it will allow any writable file to be corrupted by a malicious user. It is

recommended that this option is only used with authenticated users and then only in certain directories.

26. 501 REST not compatible with server configuration

As mentioned in the description of the HiddenStor configuration directive, use of that directive is incompatible with the FTP

command REST. Either disable use of REST with the AllowRetrieveRestart and AllowStoreRestart directives, or do not use

HiddenStor.

27. The time being displayed is wrong

The default behaviour for ProFTPD is to display all times relative to GMT. To use local time set "TimesGMT off" in the server

section of the config. There is a known issue with Redhat 7, with regard to time handling.

http://www.redhat.com/support/errata/rh7-errata-bugfixes.html

28. Authentication is taking too long

Make sure that ReverseDNS is disabled, turn off ident lookups. Additionally check the size of your /etc/passwd (or shadow)

file, if it is large then the only solution may be to move to another authentication scheme.

29. Corrupted files

There appear to be some problems with both the use of sendfile() in ProFTPD and with the implementation within certain

operating systems.

30. Can I upgrade ProFTPD without terminating the current sessions?

Short answer, no. Longer answer is no, but you can minimise the effects. The cleanest approach on servers which have

significant amounts of traffic appears to be to use ftpshut to block new connections and terminate existing ones after a pre

-determined time period and then to upgrade and restart. This approach limits the number of downloads which are terminated

part way through.

31. No such group "nogroup"

The default ProFTPD configuration file uses the user "nouser" and the group "nogroup", some systems / distributions do not

have the group "nogroup" defined. The solution is to either add the group "nogroup" to /etc/groups or to change the "nogroup"

entry in the proftpd.conf to a group which does exist.

32. Why do I see "unable to set groups: Invalid argument"?

The setting of the group privileges for a process uses the setgroups(2) system call. This call will fail with the above error

message for one of two reasons: there is a negative GID value for one of the groups, or the maximum number of groups for a

single user has been exceeded.

Ideally, all IDs, both UID and GID, will be positive. Unfortunately, it is common on many systems to use -1 or -2, especially

for such users as "nobody", or group "nogroup". Use of these values uses C"s treatment of data types to make the actual

numeric value very high; some functions, like setgroups(), do not like this, though. In general, always use positive ID

numbers.

The other limitation is the number of supplemental groups for a user (eg non-primary groups, the ones configured in

/etc/group). The maximum number of supplemental groups to which a user may belong is defined by the operating system constant

NGROUPS_MAX. On some operating systems, such as Solaris, this limitation may be tunable.

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