Visit The New, Modern Unix Linux Community

Connections not shown in netstat output

Thread Tools Search this Thread
Special Forums IP Networking Connections not shown in netstat output
# 1  
Connections not shown in netstat output

I have a TCPIP server application (a Vendor package) which by default allows 10 connections. It provides a parameter to allow us to increase the maximum allowable connections in case it is needed. Intermittently this application is failing with maximum number of connections reached even when there is no client activities. I am the application support and do not have root authority. When the error occour, I use netstat -an to display the connections. But I do not see any connection to the port that the server application is listening on. The server application is listening on port 7780, the command I used was netstat -an | grep 7780. But there no connection showing. I also pipe the output of netstat -an to a file and read through it carefully. I did not see any connection to that port. Is it possible that netstat -a will not show all connections or do I actually need root authority to see all ? If not, then how can I determine what is the problem.
# 2  
Perhaps someone can help mr to under this lsof output
When the maximum connection 10 error occur I tried
$ lsof -i | grep 2773156
AppServ 2773156 apuser 263u IPv6 0xf100060005936398 0t0 TCP *:7780 (LISTEN)
AppServ 2773156 apuser 283u IPv6 0xf100060004feca90 0t0 TCP dev1.cs.ata:*->
AppServ 2773156 apuser 288u IPv6 0xf10006000287d290 0t0 TCP dev1.cs.ata:*->
AppServ 2773156 apuser 323u IPv4 0xf100060005563b98 0t0 TCP dev1.cs.ata:53553->dev2.cs.ctc:25550 (ESTABLISHED)

Where 2773156 is the application process and it is listening on 7780

I saw the 7780 listener and 9 of
AppServ 2773156 apuser 283u IPv6 0xf100060004feca90 0t0 TCP dev1.cs.ata:*->

I think this represents 9 connections. But it does not say what port. Instead it has :*.
What does :* means ? If this are connections, why there is no status (such as ESTABLISHED) like the one coming from dev2.cs.ctc:25550 ?

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #977
Difficulty: Medium
A Linux Kernel Code of Conflict was introduced on 8 March 2012.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Filtering netstat command output

Hi All, I am trying to collect the listen ports info from netstat command in centos 7 From that info i am trying to collect all the foreign address IP for those ports. I am using below script to do the same. netstat -an |grep -w "LISTEN" |grep -v "" |awk '{print $4}' >... (3 Replies)
Discussion started by: sravani25
3 Replies

2. Shell Programming and Scripting

netstat output

Hi Team, Below is the output of netstat -an | grep 1533 tcp 0 0 ESTABLISHED tcp 0 0 ESTABLISHED Below is the o/p of netstat -a | grep server_name tcp 0 ... (4 Replies)
Discussion started by: Girish19
4 Replies

3. IP Networking

Need to know reason for connections closed in netstat -p tcp

Hello netstat -p give below 6634176 connections as closed.How do we trace that which all connections are being closed on the server? 1366888371 data packet headers correctly predicted 1195906 connection requests 5227320 connection accepts 5992919... (6 Replies)
Discussion started by: Vishal_dba
6 Replies

4. UNIX for Dummies Questions & Answers

netstat -an output, pls. explain..

Hi, I have old SCO O/S. System keeps crashing. I made lot of changes to kernel but so for nothing helped. I wrote a script which takes netstat -an output every one minute. I saw some thing right before the system crashed. Not sure if this means anything.. uname -a SCO_SV djx2 3.2... (2 Replies)
Discussion started by: samnyc
2 Replies

5. IP Networking

netstat output

I can't tell what the output of the netstat command means. Is there anywhere that has this information? I tried the man pages, but they weren't helpful. (3 Replies)
Discussion started by: Ultrix
3 Replies

6. UNIX for Dummies Questions & Answers

interpreting netstat output

hi all, when I run- wcars1j5#netstat -an | grep 8090 *.* 0 0 49152 0 LISTEN wcars1j5# 1. does this mean that no one is connected to this port? Regards, akash (1 Reply)
Discussion started by: akash_mahakode
1 Replies

7. HP-UX

Difference in netstat -a and -an output.

Hi, Does anyone know why I get a different output when using "netstat -a" or "netstat -an" ?? # netstat -a | grep ts15r135 tcp 0 0 nbsol152.62736 ts15r135.23211 ESTABLISHED # netstat -an | grep tcp 0 0 ... (4 Replies)
Discussion started by: ejdv
4 Replies

8. Solaris

netstat -an -- meaning of the output

Dear Experts, I put below command- could you please describe the outputs column- let me describe some them- col_1: ( The IP address of the local computer and the port number being used for this particular connection appear in the Local Address column. col_2:... (3 Replies)
Discussion started by: thepurple
3 Replies

9. Shell Programming and Scripting

filtering a range of ports out of a netstat output

i'd like to grep a range of ports on a netstat -nt output, localaddress, say :1 to :1023. how do i do it via sed/awk/grep? Thanks, Marc (1 Reply)
Discussion started by: marcpascual
1 Replies

10. UNIX for Dummies Questions & Answers

output of NETSTAT

# netstat -in Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll net1 1500 192.168 24508 0 12212 112931 2795 lo0 8232 127 42 0 42 0 0 atl0* 8232 none none No Statistics... (1 Reply)
Discussion started by: samprax
1 Replies

Featured Tech Videos