How to determine cipher in use when using ldapsearch?

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I'm trying to debug an LDAPS connection from Ubuntu 14.04 to some sort of VIP. There are 6 nodes behind the VIP. The connection only succeeds "sometimes". A wireshark log shows the failing connections being issued TLSv1.2 Alerts "Fatal, Illegal Parameter" with a Content Type "Alert (21)" which apparently only means wireshark can't decrypt the alert record.
enter image description here



I don't have access to the server's private key so I cannot decrypt the wireshark session. I'm trying to get the server admin to do it. In the meantime, is there any way to find out what cipher is being settled on with the connection does work? I've tried ldapsearch -d 255 ... but it doesn't reveal anything about the cipher that I can see, so far.



When the connection does succeed, The TLS record layer in wireshark says looks like this, if it's of any use:
enter image description here






ssl openldap gnutls







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    I'm trying to debug an LDAPS connection from Ubuntu 14.04 to some sort of VIP. There are 6 nodes behind the VIP. The connection only succeeds "sometimes". A wireshark log shows the failing connections being issued TLSv1.2 Alerts "Fatal, Illegal Parameter" with a Content Type "Alert (21)" which apparently only means wireshark can't decrypt the alert record.
    enter image description here



    I don't have access to the server's private key so I cannot decrypt the wireshark session. I'm trying to get the server admin to do it. In the meantime, is there any way to find out what cipher is being settled on with the connection does work? I've tried ldapsearch -d 255 ... but it doesn't reveal anything about the cipher that I can see, so far.



    When the connection does succeed, The TLS record layer in wireshark says looks like this, if it's of any use:
    enter image description here






    ssl openldap gnutls







    share|improve this question























      up vote
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      up vote
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      down vote

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      I'm trying to debug an LDAPS connection from Ubuntu 14.04 to some sort of VIP. There are 6 nodes behind the VIP. The connection only succeeds "sometimes". A wireshark log shows the failing connections being issued TLSv1.2 Alerts "Fatal, Illegal Parameter" with a Content Type "Alert (21)" which apparently only means wireshark can't decrypt the alert record.
      enter image description here



      I don't have access to the server's private key so I cannot decrypt the wireshark session. I'm trying to get the server admin to do it. In the meantime, is there any way to find out what cipher is being settled on with the connection does work? I've tried ldapsearch -d 255 ... but it doesn't reveal anything about the cipher that I can see, so far.



      When the connection does succeed, The TLS record layer in wireshark says looks like this, if it's of any use:
      enter image description here






      ssl openldap gnutls







      share|improve this question













      I'm trying to debug an LDAPS connection from Ubuntu 14.04 to some sort of VIP. There are 6 nodes behind the VIP. The connection only succeeds "sometimes". A wireshark log shows the failing connections being issued TLSv1.2 Alerts "Fatal, Illegal Parameter" with a Content Type "Alert (21)" which apparently only means wireshark can't decrypt the alert record.
      enter image description here



      I don't have access to the server's private key so I cannot decrypt the wireshark session. I'm trying to get the server admin to do it. In the meantime, is there any way to find out what cipher is being settled on with the connection does work? I've tried ldapsearch -d 255 ... but it doesn't reveal anything about the cipher that I can see, so far.



      When the connection does succeed, The TLS record layer in wireshark says looks like this, if it's of any use:
      enter image description here






      ssl openldap gnutls




      ssl openldap gnutls






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 7 hours ago









      Server Fault

      178110




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          I think you need to use OpenSSL to connect to the server and see what ciphers are returned.



          Try



          openssl s_client -connect ldapserver.domain:636


          It should return a line for "Ciphers"






          share|improve this answer




















          • Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
            – Server Fault
            6 hours ago











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          up vote
          0
          down vote













          I think you need to use OpenSSL to connect to the server and see what ciphers are returned.



          Try



          openssl s_client -connect ldapserver.domain:636


          It should return a line for "Ciphers"






          share|improve this answer




















          • Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
            – Server Fault
            6 hours ago















          up vote
          0
          down vote













          I think you need to use OpenSSL to connect to the server and see what ciphers are returned.



          Try



          openssl s_client -connect ldapserver.domain:636


          It should return a line for "Ciphers"






          share|improve this answer




















          • Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
            – Server Fault
            6 hours ago













          up vote
          0
          down vote










          up vote
          0
          down vote









          I think you need to use OpenSSL to connect to the server and see what ciphers are returned.



          Try



          openssl s_client -connect ldapserver.domain:636


          It should return a line for "Ciphers"






          share|improve this answer












          I think you need to use OpenSSL to connect to the server and see what ciphers are returned.



          Try



          openssl s_client -connect ldapserver.domain:636


          It should return a line for "Ciphers"







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 7 hours ago









          zymhan

          220110




          220110











          • Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
            – Server Fault
            6 hours ago

















          • Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
            – Server Fault
            6 hours ago
















          Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
          – Server Fault
          6 hours ago





          Looks like: Protocol : TLSv1.2 Cipher : AES256-SHA. So, the server only supports that cipher? Maybe I should mention ldapsearch is compiled against gnutls on my system and not openssl if that matters.
          – Server Fault
          6 hours ago


















           

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