Connection reset by peer

[pedramardakani]

Hi there 👋 I have been using INDI and developing my custom client for a while now. But recently I've ran into this strange problem:

Let's say I have four machines, namely A, B, C (on the same network) and D (separate network). All machines have INDI installed (different releases). I can connect from all machines to others except from B to any other machine. I can connect from A to B, but not the other way around!

I tried upgrading machine B's INDI up to the latest release, but it didn't help. Previously I was able to connect via machine B to others. But I had it removed from the network and re-plugged it. Now it is not working ... . This might be a network problem. But I don't know how to address it. Any ideas?

I did try user@B$ nc -vz IPOFMACHINEA 7624 and it returns success (meaning the port is open) but when I try to query for a property, it prints:

user@B$ indi_getprop -v IPOFMACHINEA "*.*.*"
looking for *.*.*
Connected to IPOFMACHINEA on port 7624
Queried properties from *
read: Connection reset by peer

For sake of completeness, here are the outputs when I first start up machine A:

user@A$ indiserver -vvv indi_sbig_ccd                                   
2023-03-20T14:14:16: startup: indiserver -vvv indi_sbig_ccd                                                                                                
2023-03-20T14:14:16: Driver indi_sbig_ccd: pid=4587 rfd=3 wfd=6 efd=7
2023-03-20T14:14:16: listening to port 7624 on fd 4                          
2023-03-20T14:14:16: Driver indi_sbig_ccd: sending msg copy 1 nq 1:
<getProperties version='1.7'/>                                               
                                      
2023-03-20T14:14:18: Driver indi_sbig_ccd: OpenDriver: CC_OPEN_DRIVER successfull
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties Telescope Simulator EQUATORIAL_EOD_COORD 
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on Telescope Simulator.EQUATORIAL_EOD_COORD
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties Telescope Simulator TELESCOPE_INFO 
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on Telescope Simulator.TELESCOPE_INFO
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties Telescope Simulator GEOGRAPHIC_COORD 
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on Telescope Simulator.GEOGRAPHIC_COORD
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties Focuser Simulator ABS_ROTATOR_ANGLE 
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on Focuser Simulator.ABS_ROTATOR_ANGLE
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties CCD Simulator FILTER_SLOT 
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on CCD Simulator.FILTER_SLOT
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties CCD Simulator FILTER_NAME 
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on CCD Simulator.FILTER_NAME
2023-03-20T14:14:18: Driver indi_sbig_ccd: read getProperties SQM SKY_QUALITY  
2023-03-20T14:14:18: Driver indi_sbig_ccd: snooping on SQM.SKY_QUALITY
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD CONNECTION Idle rw
    CONNECT='Off'                     
 DISCONNECT='On'                      
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defTextVector SBIG CCD DRIVER_INFO Idle ro
 DRIVER_NAME='SBIG CCD'               
 DRIVER_EXEC='indi_sbig_ccd'                                                 
 DRIVER_VERSION='1.9'                 
 DRIVER_INTERFACE='22'                
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defNumberVector SBIG CCD POLLING_PERIOD Idle rw
  PERIOD_MS='1000'                    
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD SIMULATION Idle rw
     ENABLE='Off'                     
    DISABLE='On'                      
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD CONFIG_PROCESS Idle rw
 CONFIG_LOAD='Off'                    
 CONFIG_SAVE='Off'                    
 CONFIG_DEFAULT='Off'                 
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defTextVector SBIG CCD ACTIVE_DEVICES Idle rw
 ACTIVE_TELESCOPE='Telescope Simulator'                                      
 ACTIVE_FOCUSER='Focuser Simulator'                                          
 ACTIVE_FILTER='CCD Simulator'                                               
 ACTIVE_SKYQUALITY='SQM'
2023-03-20T14:14:18: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD DEVICE_PORT_TYPE Idle rw
   Ethernet='Off'                     
      USB 1='On'                      
      USB 2='Off'                     
      USB 3='Off'                     
      USB 4='Off'                     
      LPT 1='Off'                     
      LPT 2='Off'                     
      LPT 3='Off'

and when I try connecting to it via machine B, this follows:

2023-03-20T14:16:38: Client 0: new arrival from 172.18.1.47:47698 - welcome!                                                                               
2023-03-20T14:16:38: Client 0: read getProperties                                                                                                          
2023-03-20T14:16:38: Driver indi_sbig_ccd: queuing responsible for <getProperties device='' name=''>
2023-03-20T14:16:38: Driver indi_sbig_ccd: sending msg copy 1 nq 1:                                                                                        
<getProperties version="1.7"/>                                                                                                                             
                                                                                                                                                           
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD CONNECTION Idle rw
    CONNECT='Off'                                                                                                                                          
 DISCONNECT='On'                                                                                                                                           
2023-03-20T14:16:38: Client 0: queuing <defSwitchVector device='SBIG CCD' name='CONNECTION'>                                                               
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defTextVector SBIG CCD DRIVER_INFO Idle ro
 DRIVER_NAME='SBIG CCD'                                                                                                                                    
 DRIVER_EXEC='indi_sbig_ccd'                                                                                                                               
 DRIVER_VERSION='1.9'                                                        
 DRIVER_INTERFACE='22'                                                                                                                                     
2023-03-20T14:16:38: Client 0: queuing <defTextVector device='SBIG CCD' name='DRIVER_INFO'>                                                                
2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 2:                                                                                                    
<defSwitchVector device="SBIG CCD" name="CONNECTION" label="Connection" group="Main Control" state="Idle" perm="rw" rule="OneOfMany" timeout="60" timestamp
="2023-03-20T14:16:38">               
    <defSwitch name="CONNECT" label="Connect">                               
Off                                   
    </defSwitch>                      
    <defSwitch name="DISCONNECT" label="Disconnect">
On                                    
    </defSwitch>                      
</defSwitchVector>                    

2023-03-20T14:16:38: Driver indi_sbig_ccd: read defNumberVector SBIG CCD POLLING_PERIOD Idle rw
  PERIOD_MS='1000'                    
2023-03-20T14:16:38: Client 0: queuing <defNumberVector device='SBIG CCD' name='POLLING_PERIOD'>
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD SIMULATION Idle rw
     ENABLE='Off'                     
    DISABLE='On'                      
2023-03-20T14:16:38: Client 0: queuing <defSwitchVector device='SBIG CCD' name='SIMULATION'>
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD CONFIG_PROCESS Idle rw
 CONFIG_LOAD='Off'                    
 CONFIG_SAVE='Off'                    
 CONFIG_DEFAULT='Off'                 
2023-03-20T14:16:38: Client 0: queuing <defSwitchVector device='SBIG CCD' name='CONFIG_PROCESS'>
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defTextVector SBIG CCD ACTIVE_DEVICES Idle rw
 ACTIVE_TELESCOPE='Telescope Simulator'                                      
 ACTIVE_FOCUSER='Focuser Simulator'                                          
 ACTIVE_FILTER='CCD Simulator'                                               
 ACTIVE_SKYQUALITY='SQM'
2023-03-20T14:16:38: Client 0: queuing <defTextVector device='SBIG CCD' name='ACTIVE_DEVICES'>                                                    [142/993]
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD DEVICE_PORT_TYPE Idle rw
   Ethernet='Off'                     
      USB 1='On'                      
      USB 2='Off'                     
      USB 3='Off'                     
      USB 4='Off'                     
      LPT 1='Off'                     
      LPT 2='Off'                     
      LPT 3='Off'                     
2023-03-20T14:16:38: Client 0: queuing <defSwitchVector device='SBIG CCD' name='DEVICE_PORT_TYPE'>
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD DEBUG Idle rw
     ENABLE='Off'                     
    DISABLE='On'                      
2023-03-20T14:16:38: Client 0: queuing <defSwitchVector device='SBIG CCD' name='DEBUG'>
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defTextVector SBIG CCD ACTIVE_DEVICES Idle rw
 ACTIVE_TELESCOPE='Telescope Simulator'                                      
 ACTIVE_FOCUSER='Focuser Simulator'                                          
 ACTIVE_FILTER='CCD Simulator'                                               
 ACTIVE_SKYQUALITY='SQM'              
2023-03-20T14:16:38: Client 0: queuing <defTextVector device='SBIG CCD' name='ACTIVE_DEVICES'>
2023-03-20T14:16:38: Driver indi_sbig_ccd: read defSwitchVector SBIG CCD DEVICE_PORT_TYPE Idle rw
   Ethernet='Off'                     
      USB 1='On'                      
      USB 2='Off'                     
      USB 3='Off'                     
      USB 4='Off'                     
      LPT 1='Off'                     
      LPT 2='Off'                     
      LPT 3='Off'                     
2023-03-20T14:16:38: Client 0: queuing <defSwitchVector device='SBIG CCD' name='DEVICE_PORT_TYPE'>
2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 9:
<defTextVector device="SBIG CCD" name="DRIVER_INFO" label="Driver Info" group="General Info" state="Idle" perm="ro" timeout="60" timestamp="2023-03-20T14:1
6:38">                                
    <defText name="DRIVER_NAME" label="Name">                                
SBIG CCD                              
    </defText>                        
    <defText name="DRIVER_EXEC" label="Exec">                                
indi_sbig_ccd                         
    </defText>                        
    <defText name="DRIVER_VERSION" label="Version">                          
1.9                                   
    </defText>                        
    <defText name="DRIVER_INTERFACE" label="Interface">
22                                                                                                                                                 [98/993]
    </defText>                        
</defTextVector>                      

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 8:
<defNumberVector device="SBIG CCD" name="POLLING_PERIOD" label="Polling" group="Options" state="Idle" perm="rw" timeout="0" timestamp="2023-03-20T14:16:38"
>                                     
    <defNumber name="PERIOD_MS" label="Period (ms)" format="%.f" min="10" max="60000" step="1000">
1000                                  
    </defNumber>                      
</defNumberVector>                    

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 7:
<defSwitchVector device="SBIG CCD" name="SIMULATION" label="Simulation" group="Options" state="Idle" perm="rw" rule="OneOfMany" timeout="0" timestamp="2023
-03-20T14:16:38">                     
    <defSwitch name="ENABLE" label="Enable">                                 
Off                                   
    </defSwitch>                      
    <defSwitch name="DISABLE" label="Disable">                               
On                                    
    </defSwitch>                      
</defSwitchVector>                    

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 6:
<defSwitchVector device="SBIG CCD" name="CONFIG_PROCESS" label="Configuration" group="Options" state="Idle" perm="rw" rule="AtMostOne" timeout="0" timestam
p="2023-03-20T14:16:38">              
    <defSwitch name="CONFIG_LOAD" label="Load">                              
Off                                   
    </defSwitch>                      
    <defSwitch name="CONFIG_SAVE" label="Save">                              
Off                                   
    </defSwitch>                      
    <defSwitch name="CONFIG_DEFAULT" label="Default">
Off                                   
    </defSwitch>                      
</defSwitchVector>                    

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 5:
<defTextVector device="SBIG CCD" name="ACTIVE_DEVICES" label="Snoop devices" group="Options" state="Idle" perm="rw" timeout="60" timestamp="2023-03-20T14:1
6:38">                                
    <defText name="ACTIVE_TELESCOPE" label="Telescope">
Telescope Simulator                   
    </defText>                        
    <defText name="ACTIVE_FOCUSER" label="Focuser">                          
Focuser Simulator
    </defText>                                                                                                                                     [53/993]
    <defText name="ACTIVE_FILTER" label="Filter">                            
CCD Simulator                         
    </defText>                        
    <defText name="ACTIVE_SKYQUALITY" label="Sky Quality">
SQM                                   
    </defText>                        
</defTextVector>                      

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 4:
<defSwitchVector device="SBIG CCD" name="DEVICE_PORT_TYPE" label="Port" group="Main Control" state="Idle" perm="rw" rule="OneOfMany" timeout="0" timestamp=
"2023-03-20T14:16:38">                
    <defSwitch name="Ethernet" label="Ethernet">                             
Off                                   
    </defSwitch>                      
    <defSwitch name="USB 1" label="USB 1">                                   
On                                    
    </defSwitch>                      
    <defSwitch name="USB 2" label="USB 2">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="USB 3" label="USB 3">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="USB 4" label="USB 4">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="LPT 1" label="LPT 1">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="LPT 2" label="LPT 2">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="LPT 3" label="LPT 3">                                   
Off                                   
    </defSwitch>                      
</defSwitchVector>                    

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 3:
<defSwitchVector device="SBIG CCD" name="DEBUG" label="Debug" group="Options" state="Idle" perm="rw" rule="OneOfMany" timeout="0" timestamp="2023-03-20T14:
16:38">                               
    <defSwitch name="ENABLE" label="Enable">                                 
Off                                   
    </defSwitch>                      
    <defSwitch name="DISABLE" label="Disable">
On                                                                                                                                                  [8/993]
    </defSwitch>                      
</defSwitchVector>                    

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 2:
<defTextVector device="SBIG CCD" name="ACTIVE_DEVICES" label="Snoop devices" group="Options" state="Idle" perm="rw" timeout="60" timestamp="2023-03-20T14:1
6:38">                                
    <defText name="ACTIVE_TELESCOPE" label="Telescope">
Telescope Simulator                   
    </defText>                        
    <defText name="ACTIVE_FOCUSER" label="Focuser">                          
Focuser Simulator                     
    </defText>                        
    <defText name="ACTIVE_FILTER" label="Filter">                            
CCD Simulator                         
    </defText>                        
    <defText name="ACTIVE_SKYQUALITY" label="Sky Quality">
SQM                                   
    </defText>                        
</defTextVector>                      

2023-03-20T14:16:38: Client 0: sending msg copy 1 nq 1:
<defSwitchVector device="SBIG CCD" name="DEVICE_PORT_TYPE" label="Port" group="Main Control" state="Idle" perm="rw" rule="OneOfMany" timeout="0" timestamp=
"2023-03-20T14:16:38">                
    <defSwitch name="Ethernet" label="Ethernet">                             
Off                                   
    </defSwitch>                      
    <defSwitch name="USB 1" label="USB 1">                                   
On                                    
    </defSwitch>                      
    <defSwitch name="USB 2" label="USB 2">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="USB 3" label="USB 3">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="USB 4" label="USB 4">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="LPT 1" label="LPT 1">                                   
Off                                   
    </defSwitch>                      
    <defSwitch name="LPT 2" label="LPT 2">                                   
Off                                   
    </defSwitch>
    <defSwitch name="LPT 3" label="LPT 3">                                   
Off                                   
    </defSwitch>                      
</defSwitchVector>                    

2023-03-20T14:16:38: Client 0: read: Connection reset by peer
2023-03-20T14:16:38: Client 0: shut down complete - bye!

Also, the INDI versions on the machines:

Machine A:

user@A$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"

user@A$ uname -a
Linux A 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

user@A$ indiserver --version
2023-03-20T14:19:36: startup: indiserver --version 
Usage: indiserver [options] driver [driver ...]
Purpose: server for local and remote INDI drivers
INDI Library: 1.7.4
Code $Rev$. Protocol 1.7.

and machine B:

user@B$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"

user@B$ uname -a
Linux B 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

user@B$ indiserver --version
2023-03-20T13:25:51: startup: indiserver --version 
Usage: indiserver [options] driver [driver ...]
Purpose: server for local and remote INDI drivers
INDI Library: 1.9.2
Code 1.9.2-tgz. Protocol 1.7.