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POUnclear TLS Rec Layer-1 Encrypted Alert
 

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    <p>I am trying to access a remote webservice from an asp.net application in an iis 6 server to a remote webserver. As I wasn't able to connect, I used MS Network Monitor to look over what was happening.</p> <p>This is the TLS progress</p> <pre><code>2 15:26:31 14.03.2013 0.0000000 yyy.yyy.yyy.yyy XXX.XXX.XXX.XXX TLS TLS:TLS Rec Layer-1 HandShake: Client Hello. {TLS:4, SSLVersionSelector:3, TCP:2, IPv4:1} 3 15:26:31 14.03.2013 0.0312500 XXX.XXX.XXX.XXX yyy.yyy.yyy.yyy TLS TLS:TLS Rec Layer-1 HandShake: Server Hello.; TLS Rec Layer-2 HandShake: Certificate. {TLS:4, SSLVersionSelector:3, TCP:2, IPv4:1} 4 15:26:31 14.03.2013 0.0312500 yyy.yyy.yyy.yyy XXX.XXX.XXX.XXX TLS TLS:TLS Rec Layer-1 HandShake: Certificate. Client Key Exchange. Certificate Verify.; TLS Rec Layer-2 Cipher Change Spec; TLS Rec Layer-3 HandShake: Encrypted Handshake Message. {TLS:4, SSLVersionSelector:3, TCP:2, IPv4:1} 5 15:26:31 14.03.2013 0.0468750 XXX.XXX.XXX.XXX yyy.yyy.yyy.yyy TLS TLS:TLS Rec Layer-1 Cipher Change Spec; TLS Rec Layer-2 HandShake: Encrypted Handshake Message. {TLS:4, SSLVersionSelector:3, TCP:2, IPv4:1} 6 15:26:31 14.03.2013 0.0781250 XXX.XXX.XXX.XXX yyy.yyy.yyy.yyy TLS TLS:TLS Rec Layer-1 Encrypted Alert {TLS:4, SSLVersionSelector:3, TCP:2, IPv4:1} </code></pre> <p>And this is final TLS transaction with the alert</p> <pre><code> - TlsRecordLayer: TLS Rec Layer-1 Encrypted Alert ContentType: Encrypted Alert - Version: TLS 1.0 Major: 3 (0x3) Minor: 1 (0x1) Length: 18 (0x12) EncryptedData: Binary Large Object (18 Bytes) </code></pre> <p>And finaly this is the hex dump for the alert part.</p> <pre><code>15 03 01 00 12 CE CA A3 1C C9 44 5C AC A2 3C BB 3C F3 F9 8A A6 4F 22 </code></pre> <p>According to <a href="http://en.wikipedia.org/wiki/Transport_Layer_Security#Alert_protocol" rel="nofollow">http://en.wikipedia.org/wiki/Transport_Layer_Security#Alert_protocol</a> I tried to decode the meaning</p> <pre><code>15 = 21 dec &lt;- always 21 03 01 = major and minor Version 00 12 = lentgh </code></pre> <p>And now it gets weird. Normaly the next two bytes should be the level and description of the alert. But they make no sense. Beside that, they differ every trace I run. While the front part stays constantly the same.</p> <p>Any ideas how i can decrypt the alert? </p> <p>My first thought was that the other side may not allow TLS 1, while IIS 6 only supports TLS 1 (atleast that is what i thougt). </p> <p>Thanks alot in advanced</p>
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