Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-25 Thread Postfix User
On Fri, 25 Nov 2016 07:20:25 +0100, Josh Good stated: >On 2016 Nov 24, 16:58, Postfix User wrote: >> On Thu, 24 Nov 2016 22:04:41 +0100, Josh Good stated: >> >> >Now, having said that, there is a gotcha: the URL for the hotfix >> >offers a "Hotfix download available" button, which simply put do

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-24 Thread Josh Good
On 2016 Nov 24, 16:58, Postfix User wrote: > On Thu, 24 Nov 2016 22:04:41 +0100, Josh Good stated: > > >Now, having said that, there is a gotcha: the URL for the hotfix offers > >a "Hotfix download available" button, which simply put does NOT work. > >Microsoft seems to have silently retired that

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-24 Thread Viktor Dukhovni
On Thu, Nov 24, 2016 at 10:04:41PM +0100, Josh Good wrote: > The trick is installing hotfix KB948963, provided by Microsoft for > Windows Server 2003 on year 2008. That hotfix provides the cipher suites: Yes, that's the one: http://ietf.10.n7.nabble.com/Windows-2003-TLS-64-ciphersuite-limit

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-24 Thread Postfix User
On Thu, 24 Nov 2016 22:04:41 +0100, Josh Good stated: >Now, having said that, there is a gotcha: the URL for the hotfix offers >a "Hotfix download available" button, which simply put does NOT work. >Microsoft seems to have silently retired that hotfix from general >availability. That is bad news f

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-24 Thread Josh Good
On 2016 Nov 20, 01:38, Viktor Dukhovni wrote: > Given that Exchange on Windows 2003 only supports RC4 and 3DES, > both of which are deprecated in TLS. There's not much point in > continuing to offer TLS to the unwashed masses. Such servers > can only do TLS with specially configured front-end pro

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-19 Thread Viktor Dukhovni
On Sun, Nov 20, 2016 at 02:21:06AM +0100, Josh Good wrote: > > That's not how Postfix is expected to behave. Please post > > configuration and logs. Mind you, Postfix is not the only MTA that > > sends email over TLS, and other TLS implementations can be (and > > often are) less capable, less fo

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-19 Thread Josh Good
On 2016 Nov 19, 23:14, Viktor Dukhovni wrote: > On Sat, Nov 19, 2016 at 10:44:11PM +0100, Josh Good wrote: > > > Also, I've been able to replicate the problem, setting up a server with > > Ubuntu 16.10, which defaults to Postfix 3.1.0 as MTA and OpenSSL 1.0.2g > > as crypto subsystem. After I enab

Re: Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-19 Thread Viktor Dukhovni
On Sat, Nov 19, 2016 at 10:44:11PM +0100, Josh Good wrote: > This bug in SChannel (the SSL/TLS subsystem in Windows) in Windows > Server 2003 is well known: Indeed, it has been well known now for approximately a decade. > Also, I've been able to replicate the problem, setting up a server with >

Interoperability problem - latest Postfix on Linux vs Exchange 2007 on Win2003

2016-11-19 Thread Josh Good
Hello. I manage the email for several SMBs (between 100 and 900 mailboxes each), where they are still running on-premises Exchange 2007 on Windows Server 2003 x64. Yes, I know this is old software, but upgrading their setup is expensive because it involves getting new licenses (for the server OS,