SMPP connection attempt failed without binding.

[Timur Diachenko]

I need help with Jasmin. 

My client before had a connection with the server and we had a successful test. 

After restart SMPP link with the client, there is no connection anymore. 

Client: XXX.X.XXX.110

Jasmin: XXX.XXX.XXX.165:2775

There is log 

2021-04-23 15:01:55 WARNING  3943 SMPP connection established from XXX.X.XXX.110 to port 2775

2021-04-23 15:03:25 DEBUG    3943 SMPP connection attempt failed without binding.

2021-04-23 15:03:25 WARNING  3943 SMPP XXX.X.XXX.110 disconnected from port 2775: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionDone'>: Connection was closed cleanly.

root@smsc:/home/rescue# netstat -ano | grep XXX.X.XXX.110

tcp        0      0 XXX.XXX.XXX.165:2775    XXX.X.XXX.110:62347     ESTABLISHED off (0.00/0/0)

iptables -S

-P INPUT ACCEPT

-P FORWARD ACCEPT

-P OUTPUT ACCEPT

root@smsc:/home/rescue# sudo ufw status

Status: inactive

root@smsc:/home/rescue# cat /proc/version

Linux version 5.4.0-72-generic (buildd@lcy01-amd64-019) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #80-Ubuntu SMP Mon Apr 12 17:35:00 UTC 2021

I have tried reset jasmin, ethernet, and the server but it all doesn't help me. 

TCP dump 

Maybe someone faced an issue like this one. 

[Eudorajab]

What smpp client are you using ?

[Timur Diachenko]

I don't know what is the platform, my client uses, they check the issue too. But I want to be sure that there is no problem with Jasmin. 

It seems that the client's side doesn't try to BIND with Jasmin.  

пятница, 23 апреля 2021 г. в 17:24:09 UTC+3, Eudorajab:

[Antony Stone]

On Saturday 24 April 2021 at 10:32:32, Timur Diachenko wrote:

> I don't know what is the platform, my client uses, they check the issue
> too. But I want to be sure that there is no problem with Jasmin.
> It seems that the client's side doesn't try to BIND with Jasmin.

The tcpdump screenshot you provided earlier shows two FIN,ACK packets and an
ACK; then 5 seconds later a SYN, SYN,ACK and ACK.

The interesting part is "what happens after that?"

Following the TCP handshake, what do the client and server have to say to each
other?


Antony.

--
Is it venison for dinner again? Oh deer.

Please reply to the list;
please *don't* CC me.

[Timur Diachenko]

Yes, but nothing happens, only SYN, SYN, ACK and ACK. 

Jasmin is a server and the client has to bind to Jasmin, but nothing happened after TCP handshake. 

суббота, 24 апреля 2021 г. в 11:37:54 UTC+3, Antony Stone: