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IT15184: (SSH) DH_GEX GROUP OUT OF RANGE

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • User attempts to connect but the key exchange is rejected.

Last part of message received by customers is:
debug2: mac_setup: setup hmac-sha1
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug2: mac_setup: setup hmac-sha1
debug1: kex: client->server aes128-ctr hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1536<7680<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
DH_GEX group out of range: 1536 !< 1024 !< 8192
Couldn't read packet: Connection reset by peer

Local fix

  • STRRTC - 492949
RJ/RJ
Circumvention:
Update to latest SSP Build

Problem summary

  • When using the latest version on an SFTP client, such as
OpenSSH, it is possible that connections to SSP SFTP adapters
will fail with this error: DH_GEX group out of range: 1536 !<
1024 !< 8192.

Problem conclusion

  • Code has been added to SSP to correctly negotiate a key size
during the Diffie Hellman key exchange.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT15184
    • 

  • Reported component name
    STR SECURE PROX
    • 

  • Reported component ID
    5725D0300
    • 

  • Reported release
    342
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2016-05-09
    • 

  • Closed date
    2016-05-18
    • 

  • Last modified date
    2016-05-18
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    STR SECURE PROX
    • 

  • Fixed component ID
    5725D0300
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SS6PNW","label":"Sterling Secure Proxy"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"342","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            22 May 2025
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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