I am trying to disable SSL2 on our IIS/SMTP server. We are using a Windows Server 2008 R2 Enterprise (64bit). We use the IIS6 Manager to manage the SMTP virtual servers. I have attempted numerous methods but have been unsuccessful in all. I have fully rebooted
after every change too.
I am testing from another server with the following command, but still show as connected via SSL2:
$ openssl s_client -debug -connect servername:25 -ssl2
CONNECTED(00000003)
write to 0x600078840 [0x600181951] (45 bytes => 45 (0x2D))
0000 - 80 2b 01 00 02 00 12 00-00 00 10 03 00 80 01 00 .+..............
0010 - 80 07 00 c0 06 00 40 04-00 80 02 00 80 ba 66 21 ......@.......f!
0020 - fe 2d 4c 49 44 b9 23 e5-f9 10 a5 21 7f .-LID.#....!.
read from 0x600078840 [0x600070790] (2 bytes => 2 (0x2))
0000 - 32 32 22
read from 0x600078840 [0x600070792] (12851 bytes => 123 (0x7B))
0000 - 30 20 6d 61 69 6c 2e 65-67 32 2e 66 69 65 6c 64 0 mail.ourdomain
0010 - 67 6c 61 73 73 2e 6e 65-74 20 4d 69 63 72 6f 73 name.net Micros
0020 - 6f 66 74 20 45 53 4d 54-50 20 4d 41 49 4c 20 53 oft ESMTP MAIL S
0030 - 65 72 76 69 63 65 2c 20-56 65 72 73 69 6f 6e 3a ervice, Version:
0040 - 20 37 2e 35 2e 37 36 30-31 2e 31 37 35 31 34 20 7.5.7601.17514
0050 - 72 65 61 64 79 20 61 74-20 20 57 65 64 2c 20 38 ready at Wed, 8
0060 - 20 4a 75 6c 20 32 30 31-35 20 31 34 3a 32 36 3a Jul 2015 14:26:
0070 - 31 35 20 2b 30 30 30 30-20 0d 0a 15 +0000 ..
I started with Microsoft’s recommendation: https://support.microsoft.com/en-us/kb/187498
Instead of PCT 1.0, I used SSL 2.0:
To disable the PCT 1.0 protocol so that IIS does not try to negotiate using the PCT 1.0 protocol, follow these steps:
Click Start, click Run, type regedt32 or type regedit, and then click OK. In Registry Editor, locate the following registry key: HKey_Local_Machine\System\CurrentControlSet\Control\SecurityProviders \SCHANNEL\Protocols\PCT 1.0\Server
On the Edit menu, click Add Value. In the Data Type list, click DWORD. In the Value Name box, type Enabled, and then click OK.
Note If this value is present, double-click the value to edit its current value. Type 00000000 in Binary Editor to set the value of the new key equal to "0". Click OK. Restart the computer.
I have also tried this method: http://forums.iis.net/t/1151822.aspx?Disable+SSL+v2+in+IIS7+
I even tried using IIS Crypto and still show as connecting via SSL2.
I am running in circles and turning to anyone for help. Thanks in advance.