RE: [JSch-users] Session connect very slow !!

[Tamir G. <ta...@ta...>]

Hello Mauricio,

 

It is possible that the slow connection has nothing to do with JSch. Did you
try the time it takes to connect using other ssh clients?

I have experienced similar behavior with OpenSSH on Windows XP, but the slow
connect happens regardless of the client used.

For example connecting with OpenSSH client to OpenSSH server on localhost
takes about 12 seconds.

 

  _____  

From: jsc...@li...
[mailto:jsc...@li...] On Behalf Of Mauricio
Farache
Sent: Thursday, March 02, 2006 14:11
To: jsc...@li...
Subject: [JSch-users] Session connect very slow !!

 

Hi JSch users,

I've more information about the problem on slow session connect calls .
(more than 11 sec)
, I raised 3 days ago

I've added some trace debug lines on the Session classes.

I traced the connect method 

I_S:len=588
kex: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
server_host_key: ssh-dss
cipher.c2s:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,r
ijn...@ly...,aes128-ctr,aes192-ctr,aes256-ctr
cipher.s2c:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,r
ijn...@ly...,aes128-ctr,aes192-ctr,aes256-ctr
mac.c2s:
hmac-md5,hmac-sha1,hmac-ripemd160,hma...@op...,hmac-sha1-96,hm
ac-md5-96
mac.s2c:
hmac-md5,hmac-sha1,hmac-ripemd160,hma...@op...,hmac-sha1-96,hm
ac-md5-96
compression.c2s: none,zlib
compression.s2c: none,zlib
lang.c2s:
lang.s2c:
?: 0
??: 0

receive_kexinit 1 Execution time: ms9

     send_kexinit 1.1 Execution time: ms0
     send_kexinit 1.2 Execution time: ms0
     send_kexinit 1.3 Execution time: ms0
     send_kexinit 1.4 Execution time: ms5007   // 
     send_kexinit 1.5 Execution time: ms1
     send_kexinit 1.6  Execution time: ms1

receive_kexinit 2 Execution time: ms5011

receive_kexinit 3 Execution time: ms9
receive_kexinit 4 Execution time: ms0
receive_kexinit 5 Execution time: ms10
receive_kexinit 6 Execution time: ms5045

The step 2 corresponds to the time spent in the call send_kexinit() from the
method receive_kexinit;

The step 1.4 Exactly is the piece of code that lives inside this method.

System.out.println("send_kexinit 1.3 Execution time: ms" + (fin - inicio));
        inicio = System.currentTimeMillis();

        synchronized (random) {
            random.fill(buf.buffer, buf.index, 16);
            buf.skip(16);
        }
        fin = System.currentTimeMillis();
        System.out.println("send_kexinit 1.4 Execution time: ms" + (fin -
inicio));

The step 6 corresponds to the time spent in the call 
kex.init(this, V_S, V_C, I_S, I_C); 

I guess that there must some similar problem with it.

Any suggestion about why is this happening?

I'm using 1.0.25 + patch for downloads published.
My client is running on Solaris connecting to an OpenSSH server running on
Windows XP.
The release is OpenSSH 3.8.1p1

Regards