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Top Forums UNIX for Advanced & Expert Users Application showing "Connection Time Out" very often Post 303044590 by anaigini45 on Thursday 27th of February 2020 04:53:30 AM
Old 02-27-2020
Application showing "Connection Time Out" very often

Hi,


We have a web serveer running on Apache-Tomcat-6.0.32. For 2 months continuously, we noticed that the app on this server setup has been frequently sending out intermittent "Connection Time Out" issues.
On the OS side, I investigated a lot of things,



1) tcpdump : did not find anything suspicious (no large flooding of suspicious IP, etc)
2) In the apache access_log nothing suspicious either.
3) netstat -an, tulpn : No timeout/dead connection
4) telnet to port 80 is OK


Thus, my teammate concluded that it could be a bug in the tomcat version 6.0.32 itself. Is this possible/true? How can we confirm this?
We use "Uptime" as a monitoring tool, and it sends updates every 3 mins. Whereas other monitoring tools send alerts every 5 mins or more, and do not show the "Connection Time Out" problem.
Is "Uptime" an unstable monitoring tool?
 

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ct_ftp(3erl)						     Erlang Module Definition						      ct_ftp(3erl)

NAME
ct_ftp - FTP client module (based on the FTP support of the INETS application). DESCRIPTION
FTP client module (based on the FTP support of the INETS application). DATA TYPES
connection() = handle() | target_name() (see module ct) : handle() = handle() (see module ct_gen_conn) : Handle for a specific ftp connection. EXPORTS
cd(Connection, Dir) -> ok | {error, Reason} Types Connection = connection() Dir = string() Change directory on remote host. close(Connection) -> ok | {error, Reason} Types Connection = connection() Close the FTP connection. delete(Connection, File) -> ok | {error, Reason} Types Connection = connection() File = string() Delete a file on remote host get(KeyOrName, RemoteFile, LocalFile) -> ok | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) RemoteFile = string() LocalFile = string() Open a ftp connection and fetch a file from the remote host. RemoteFile and LocalFile must be absolute paths. The config file must be as for put/3. See also: put/3 . ls(Connection, Dir) -> {ok, Listing} | {error, Reason} Types Connection = connection() Dir = string() Listing = string() List the directory Dir. open(KeyOrName) -> {ok, Handle} | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) Handle = handle() Open an FTP connection to the specified node. You can open one connection for a particular Name and use the same name as reference for all subsequent operations. If you want the connection to be associated with Handle instead (in case you need to open multiple connections to a host for example), simply use Key , the configuration variable name, to specify the target. Note that a connection that has no associated target name can only be closed with the handle value. put(KeyOrName, LocalFile, RemoteFile) -> ok | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) LocalFile = string() RemoteFile = string() Open a ftp connection and send a file to the remote host. LocalFile and RemoteFile must be absolute paths. If the target host is a "special" node, the ftp address must be specified in the config file like this: {node,[{ftp,IpAddr}]}. If the target host is something else, e.g. a unix host, the config file must also include the username and password (both strings): {unix,[{ftp,IpAddr}, {username,Username}, {password,Password}]}. recv(Connection, RemoteFile) -> ok | {error, Reason} Fetch a file over FTP. The file will get the same name on the local host. See also: recv/3 . recv(Connection, RemoteFile, LocalFile) -> ok | {error, Reason} Types Connection = connection() RemoteFile = string() LocalFile = string() Fetch a file over FTP. The file will be named LocalFile on the local host. send(Connection, LocalFile) -> ok | {error, Reason} Send a file over FTP. The file will get the same name on the remote host. See also: send/3 . send(Connection, LocalFile, RemoteFile) -> ok | {error, Reason} Types Connection = connection() LocalFile = string() RemoteFile = string() Send a file over FTP. The file will be named RemoteFile on the remote host. type(Connection, Type) -> ok | {error, Reason} Types Connection = connection() Type = ascii | binary Change file transfer type AUTHORS
<> common_test 1.5.3 ct_ftp(3erl)
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