08-08-2007
Unable to open remote connections
Hello everybody,
This is an unusual problem that I am facing on my Solaris 9 on Sun Blade 150 workstation. I can ping remote machines (outside subnet) but I can't open up a connection/port on those machines.
For example, `ping ftp.xyz.com` gives ftp.xyz.com is alive but if I do a `ftp ftp.xyz.com` or `telnet ftp.xyz.com 21`; it just gives "Trying ftp.xyz.com..." and fails. This holds true for ALL remote machines for all services (ftp, telnet, http). Gateway/routing is not the problem since pinging works. Name resolution in not a problem since `dig` also works. I haven't configured TCP wrappers or ipfilters. So where can be the problem?
Am I missing something?
Interesting part of the problem is that I can successfully telnet or ftp TO this machine (from a remote machine). But here also, there is a problem: Incoming connections (telnet or FTP) get dropped automatically after a minute or so. Although I can reconnect immediately.
Problem Summary: Outgoing connections are blocked and incoming connections work but get get dropped after some time.
Can anybody come up with something helpful at earliest? Thanks in advance.
9 More Discussions You Might Find Interesting
1. Post Here to Contact Site Administrators and Moderators
I am unable to open the mimesender thread. I get the following message when clicking on https://www.unix.com/showthread.php?p=33233#post33233 : (2 Replies)
Discussion started by: dangral
2 Replies
2. UNIX for Advanced & Expert Users
I am working on a unix server.
I killed all the processes with my id on the machine.
After that I tried to delete a file, I got an error:-
file not removed.Text File busy.
Deletion of directory prompted:-
Directory not empty.
Can anyone help me regarding this...???
Thanks,
Vikas (11 Replies)
Discussion started by: vikasrout
11 Replies
3. Linux
Hi all,
I have a couple of questions I've been searching on internet but I didn't find a suitable solution. The aim is that I'd like to access to my home Linux (an 8.04 Ubuntu) from outside. I already achieved with ssh, but I'd like to secure as much as I can. These are questions:
The... (2 Replies)
Discussion started by: AlbertGM
2 Replies
4. BSD
Hi everyone:
I have a server used for testing running FreeBSD, last weekend we had power cuts in my job and our server was constantly rebooting.
since then the network connections are very slow, it's almost impossible establish a remote connection with the server, however running any... (2 Replies)
Discussion started by: edgarvm
2 Replies
5. Shell Programming and Scripting
Not able to open a file using this code
why not?
use strict;
use warnings;
my $file = "verInfo.txt";
unless(open FILE, $file) {
# Die with error message
# if we can't open it.
die "\nUnable to open $file\n";
}
my $line = <FILE>;
print $line;
close FILE; (7 Replies)
Discussion started by: srijith
7 Replies
6. Solaris
Hi,
I have 2 solaris server. I can able to open to see cron entry by using crontab -l in one of the server. I cant able to open another server. How to check if crontab is fixed in that server. If not then how to make a crontab in that server.
Please advice.
Thanks,
Mani
----------... (1 Reply)
Discussion started by: Mani_apr08
1 Replies
7. Ubuntu
Hello friends. I am currently using Ubuntu 9.10. Its having a lot of features. I have a problem in this operating system that is unable to open Gtalk. Could i get the information to use Gtalk in Ubuntu 9.10. Please reply me. (1 Reply)
Discussion started by: andrepitt77
1 Replies
8. UNIX for Advanced & Expert Users
Hey guys,
We've been having issues on one of our CentOS 6 servers and one of the java programs that runs on it. As the software hasn't caused issues in the past, I'm wondering if its a problem with the CentOS server.
Basically, the software drops it's tcp connection and won't reconnect,... (5 Replies)
Discussion started by: jimbob01
5 Replies
9. UNIX for Advanced & Expert Users
Good morning,
Is there any command to view remote conxiones an AIX server?
Thank you very much and best regards. (1 Reply)
Discussion started by: systemoper
1 Replies
iptos(4) Kernel Interfaces Manual iptos(4)
NAME
iptos - Defines the IP Type Of Service (TOS) for FTP and Telnet
SYNOPSIS
/etc/iptos
DESCRIPTION
The /etc/iptos file configures the Type Of Service (TOS) of the Internet Protocol (IP) used by FTP and Telnet.
The TOS field in the Internet datagram is to specify how the datagram should be handled. It is a mechanism to allow control information to
have precedence over data.
Generally, protocols that are involved in direct interaction with a human should select low delay, while data transfers that involve large
blocks of data need high throughput. Finally, high reliability is most important for datagram-based Internet management functions.
In the Tru64 UNIX operating system, the ftp and telnet applications and the ftpd and telnetd daemons allow the configuring of TOS values.
These applications check to see if the /etc/iptos file exists; if the file exists, the applications obtain the TOS value from the file and
use that value to set the TOS field. If the /etc/iptos file does not exist, the applications default to the following TOS values recom-
mended by RFC1060: Low delay High throughput Low delay
Users who want to configure their own TOS values for the TOS field should provide the /etc/iptos file.
Note
Most IP routers do not differentiate based on TOS, and therefore providing values other than the default would have no affect. You
should not change the default values for FTP and Telnet.
Each entry should consist of a single line of the form:
Application Proto TOS-bits aliases
The entry fields contain the following information: The name of an application TOS entry. The protocol name for which the entry is appro-
priate. The TOS value to be set for the entry. A list of aliases that exist for the entry.
Items on an entry line are separated by any number of blanks, tabs, or combination of blanks and tabs. A number sign (#) indicates that
the rest of the line is a comment and is not interpreted by routines that search the file. Blank lines in the file are ignored.
Valid TOS entry names are ftp-control and ftp-data for FTP and telnet for Telnet.
The TOS value for the entry should be one of the following hexadecimal numbers, corresponding to TOS bits: Low delay High throughput High
reliability
If you need to disable the use of TOS bits, because you are having troubling communicating with a TCP/IP host that doe not conform entirely
with the IP specification, you can disable the TOS bits by using the the following settings in the /etc/iptos file:
# # Format of this file: # Application Proto TOS-bits aliases #
ftp-control tcp 0x0 ftp-data tcp 0x0 telnet tcp 0x0
EXAMPLES
The following example shows typical entries in the /etc/iptos file:
# # Format of this file: # Application Proto TOS-bits aliases #
ftp-control tcp 0x10 ftp-data tcp 0x08 telnet tcp 0x10
RELATED INFORMATION
RFC1060, ftp(1), telnet(1), ftpd(8), telnetd(8) delim off
iptos(4)