Login or Register to Ask a Question and Join Our Community


UNIX for Advanced & Expert Users

Login Process takes longer

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Login Process takes longer
# 1  
Old 10-19-2007
Login Process takes longer
Hello.

Since Yesterday, I notice that after giving telnet IP or SSH IP - it takes long time to display login: , I mean earlier after entering Server name It used to immediately ask for login ID and then password. But, now it takes min of 2-3 minute to ask for password.

Where can I check, whats going wrong?
# 2  
Old 10-19-2007
I usually use strace to have an idea of what a program is doing. Of course, if you do not have some C programming background the output may not make enough sense to you. It outputs the system calls being called. You can look at the neighbouring system calls around places where large latencies occur to give you an idea what happened at that time.

One possibility that I encounter recently is that reverse DNS of IPv4 addresses is down or simply being slow. In that case, the SSH process may need to timeout before trying another one. MySQL has similar issues as well.
# 3  
Old 10-20-2007
Login Process takes longer on AIX
How to turn off DNS resolutions - First of all what is DNS, and why is it coming in picture here on UNIX? Direct telnet from server back to itself is also slow. I mean, it shows connected to server but login: prompt comes delayed only. There are no performance issues also on applications.

Please advice.
# 4  
Old 10-20-2007
Exactly what happens to your system only you can trace yourself. Mine was confirmed related to DNS because that occurred on a supposedly idle server over a few days and afterwards the problem went away with no change made. That is a sign that DNS may be a cause. I could confirm with strace later that way.

For OpenSSH server side, there is a UseDNS configuration option in sshd_config. Set it to "no". Not sure about Telnet.

In fact this is in the OpenSSH FAQ:
OpenSSH FAQ
# 5  
Old 10-20-2007
Maybe try pinging the IP and check its connectiviti.
# 6  
Old 10-21-2007
what is DNS? and How does it impact to login process? What solutions are there to follow IF the issue is caused by DNS ?
# 7  
Old 10-22-2007
DNS - Domain Name Server

This is the mechanism that a host asks another host to resolve a name.

A good test is to...

login to the server
note the IP address of your client
type "nslookup ip-address" and see how long it takes to reply.

/etc/resolv.conf is a good place to start.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX and Linux Applications

database takes long time to process

Hi, we currently having a issue where when we send jobs to the server for the application lawson, it is taking a very long time to complete. here are the last few lines of the database log. 2012-09-18-10.35.55.707279-240 E244403536A576 LEVEL: Warning PID : 950492 ... (1 Reply)
Discussion started by: techy1
1 Replies

2. Red Hat

Login to server takes time

When I am trying to login to a server using Putty ssh from my windows xp machine it is taking too much time for login. My server name is http2 and when I enter this address into putty I immediately get login as: screen, but after I put my username root and enter the cursor moves downwards... (14 Replies)
Discussion started by: abhilashkrishn
14 Replies

3. Solaris

Login takes 44secs to 50secs

Hi, Anyone can help me, I have 10 servers all was Solaris 10 installed. The 9 servers was so fast ounce you login. But only 1 server will take 44secs to 55secs to login. I check all the hardware side it was ok. I'm using ssh, putty, ftp and telnet to login. Can you please me for any work... (11 Replies)
Discussion started by: fspalero
11 Replies

4. UNIX for Dummies Questions & Answers

Changing Password process takes a long time

We are running unix. After a reboot of the server we have found that changing password takes a long time. if type in passwd "username" you can type in the 1st instance of the password , press enter , then it will wait for about 3 minutes before bringing up the confirm password line typing it in... (4 Replies)
Discussion started by: AIXlewis
4 Replies

5. Shell Programming and Scripting

script to monitor the process system when a process from user takes longer than 15 min run.

get email notification from from system when a process from XXXX user takes longer than 15 min run.Let me know the time estimation for the same. hi ,any one please tell me , how to write a script to get email notification from system when a process from as mentioned above a xxxx user takes... (1 Reply)
Discussion started by: kirankrishna3
1 Replies

6. Programming

select() system call takes longer than the timeout specified

Below is my code. Every once in a while the select call takes as long as 150 seconds (discovered by printing time before and after this statement) while the timeout specified into it is only 1 second. Any clue why? I can't believe that select call which has been around for centuries can have a bug,... (15 Replies)
Discussion started by: old_as_a_fossil
15 Replies

7. UNIX and Linux Applications

Syb15 Query takes longer, help me out

When i run the below query in syb15 (with syb 12.5.X backward compatibilty) environment it runs 45min where as the same in syb12.5.1 it takes only 7-10min. But the main thing is stld_date(in the below query) does not covered in the index of that table. Also main_table is a huge table. So is it... (1 Reply)
Discussion started by: prsam
1 Replies

8. Linux

it takes long time to login on server

Hi, I am trying to login using ssh on Red Hat Linux 5 server, The password appears immediately but after I enter the password it takes about 90 seconds to login completely. Please suggest what changes require? Regards, Manoj (4 Replies)
Discussion started by: manoj.solaris
4 Replies

9. Forum Support Area for Unregistered Users & Account Problems

Can no longer login.

I registered last week, received the emails and activated my account. It worked splendidly. Today, I logged in, performed a search, then was prompted to login each time I moved to the next page in the search results. I requested and received a new password but UNIX.com thanks me for logging... (0 Replies)
Discussion started by: thebigm
0 Replies

10. Shell Programming and Scripting

Killing a process that takes too long

Hello, I have a C program that takes anywhere from 5 to 100 arguments and I'd like to run it from a script that makes sure it doesnt take too long to execute. If the C program takes more than 5 seconds to execute, i would like the shell script to kill it and return a short message to the user. ... (3 Replies)
Discussion started by: WeezelDs
3 Replies
Login or Register to Ask a Question