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SSL Reports Incorrect Maximum Buffer Size to Programs
Article ID: 300562 - View products that this article applies to.
This article was previously published under Q300562
The Secure Sockets Layer (SSL) implementation (Schannel.dll) reports an incorrect buffer size to programs, as noted in the following code fragment:
For example, if a Pine IMAP client sends a message to a Microsoft Exchange Server computer, the problem appears as though it is in the IMAP function to add sent mail only to the Sent Items folder. The mail gets through to an Microsoft Outlook Express or Netscape Messenger client without a problem.
The problem appears when you are using SSL, or if the message is larger than 16,000 bytes. If it is over the limit and you are using SSL, it works with Outlook Express and Netscape Messenger clients. When you send from a Pine client, it can work when you are using a server other than an Exchange Server computer.
The maximum buffer size that the SSL implementation (Schannel.dll) reports back to the program is incorrect. The problem is that Schannel.dll's maximum message size is 5 bytes smaller than the SSL specification of 16,384.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
260910The English version of this fix should have the following file attributes or later:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
Date Time Version Size File name --------------------------------------------------------------- 27-Aug-2001 13:12 5.0.2195.42 355,088 Advapi32.dll 27-Aug-2001 13:12 5.0.2195.41 135,440 Dnsapi.dll 27-Aug-2001 13:12 5.0.2195.36 94,992 Dnsrslvr.dll 27-Aug-2001 13:13 5.0.2195.42 525,072 Instlsa5.dll 27-Aug-2001 13:13 5.1.2195.0 163,600 Instsch5.dll 27-Aug-2001 13:12 5.0.2195.41 143,120 Kdcsvc.dll 07-Aug-2001 13:03 5.0.2195.40 197,392 Kerberos.dll 26-Jun-2001 22:16 5.0.2195.37 69,456 Ksecdd.sys 24-Aug-2001 00:26 5.0.2195.42 507,152 Lsasrv.dll 24-Aug-2001 00:26 5.0.2195.42 33,552 Lsass.exe 27-Aug-2001 13:12 5.0.2195.41 306,448 Netapi32.dll 27-Aug-2001 13:12 5.0.2195.41 358,160 Netlogon.dll 27-Aug-2001 13:12 5.0.2195.42 910,096 Ntdsa.dll 27-Aug-2001 13:12 5.0.2195.42 386,320 Samsrv.dll 27-Aug-2001 13:12 5.0.2195.41 128,784 Scecli.dll 27-Aug-2001 13:12 5.0.2195.36 299,792 Scesrv.dll 27-Aug-2001 13:03 5.1.2195.0 145,680 Schannel.dll 27-Aug-2001 13:12 5.0.2195.40 48,400 W32time.dll 01-Aug-2001 23:44 5.0.2195.40 56,592 W32tm.exe 24-Aug-2001 00:26 5.0.2195.42 507,152 Lsasrv.dll [56bit] 27-Aug-2001 13:03 5.1.2195.0 146,192 Schannel.dll [56bit]
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.
A possible side-effect of this hotfix is that the program's send buffer is also increased. This means that progrmas that are using the Schannel.dll file may start sending packets that are a little bigger than they were before you applied the hotfix. This may cause interoperability problems during communication with computers that have not yet had the hotfix applied to them.
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/249149/EN-US/ )Installing Microsoft Windows 2000 and Windows 2000 Hotfixes
Article ID: 300562 - Last Review: February 22, 2007 - Revision: 2.3