At the recent DEFCON hacking conference, security researchers demonstrated a method to crack the MS-CHAPv2 authentication protocol with a 100% success rate. MS-CHAPv2 is used as the default authentication method for remote access VPN in Forefront TMG 2010.
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With the public availability of tools to automate the cracking process, PPTP communication using MS-CHAPv2 should be considered unencrypted. There are two options available to mitigate this concern: disable MS-CHAPv2 and enable EAP with PPTP, or disable PPTP and switch to a more secure remote access VPN protocol such as L2TP/IPsec or SSTP. Enabling EAP requires the use of smart cards or certificates for authentication which makes implementation more challenging. SSTP is an excellent option as it leverages SSL/TLS to protect the MS-CHAPv2 authentication process. However, SSTP is only supported on Windows Vista SP1 and later clients. L2TP/IPsec is another good choice, and although it does support certificates it can also be configured using a pre-shared key. If long, complex passwords are used and care is taken to ensure that the password is well protected, it can provide a secure remote access solution.
Good post pointing out the potential risk in PPTP VPNs, but the fact that MS-CHAPv2 has been cracked is a scary one.There are so many things dependent on this technology like wireless authentication, dailin connectivity, 802.1x implementations etc. etc.
I tried to install TMG 2010 on windows server2012 DAtacenter, The problem in the Roles and Features appears as you know, but i instaaled the roles only manually, and after restraed the server the TMG installed successfully.
I mean, to give you an example of just how screwed up Microsoft is, they can't even release a proper Service Pack for TMG 2010 that incorporates all their hotfixes and rollups. Why? They just don't care. They've also made it very hard to find any documentation on the proper install order etc. Why? They just don't care. They never updated the documentation for it, instead they routinely direct people to the ISA 2004 docs for TMG 2010. Why? They just don't care.
What do you have today? The exact same mess. Just try to figure out what order to install the Service Packs and hotfixes for TMG in. Even worse, Microsoft's own documentation for the hotfixes contradict themselves. On the one hand, they say no prerequisites and on the other, they list prerequisites. In the end, the only smart way to do a new TMG 2010 install is to install all the service packs and hotfixes as they were released - in that order.
Dear i hope you fine. After a very long time i ask question with you regarding you TMG 2010 practice on windows server 2012 can you please tell me how you successfully install TMG manually on server 2012. I am already replace (servermanagercmd.exe) file. Please reply as soon as possible.
Finally managed to crack it. The steps provided by Wasdoc are correct (thanks!), BUT they're out of sequence. I initially upgraded the OS to 2012 R2 and repaired the TMG installation. Internet services started working immediately during the final "initialization" stage. Then, as per the above steps, I rebooted (once again, clients were able to use the Internet after services started), then added the TMG Packet Filter service to the interface. At this point, all Internet services stopped working. Running TMG repair again did not help.(EDIT: After installing TMG 2010 Standard on 2008 R2, I configured it completely, tested all the rules I might need in a production environment, installed all updates for Windows 2008 R2 as well as for TMG 2010. At this point, I made a backup of my VM's VHDX file before upgrading it to 2012 R2 for testing.)I started from scratch again with my backup VHDX, upgraded the OS to 2012 R2 and this time round, added the packet filter service to the network adapter BEFORE repairing TMG, and then rebooted. Works like a charm. The only problems i saw were: -1. "SQL Server (MSFW)" service was stopped and disabled. This is necessary for logging, so I simply enabled (set to Automatic startup) and started the service.2. "Microsoft Forefront TMG Firewall" service stopped without an error a few minutes after booting, due to which Internet services stopped working on the client end. I simply restarted the service which fixed the problem. The firewall service stops after a failed attempt to start the TMG Managed Control Service. If you reboot the server/VM, you'll need to restart the service once.3. "Microsoft Forefront TMG Managed Control" service is stopped and refuses to start. Nonetheless, all TMG services operate normally and clients are able to access the Internet. Any further changes to TMG rules and objects etc are saved and committed without any hiccups. In fact, applying changes is much faster in 2012 R2. From what I understand, unless you're running Email protection policies (spam filtering, IP blocking etc), this is really not needed.
A few months ago we published a Whitepaper detailing the steps required to securely publish Exchange to the Internet using TMG and UAG. (That document has recently been updated by the way, and the newest version is available here White Paper - Publishing Exchange Server 2010 with Forefront).
Exchange Server 2010 like its predecessor Exchange Server 2007 makes heavy use of SSL certificates for various communications protocols. When you install a new Exchange server is comes pre-configured with a self-signed certificate. Before putting a new server into production you should create and assign a new SSL cert for the server.
Hi Paul,I have a third party SAN cert on my Exchange 2010 server that covers IIS and SMTP. This certificate covers all of the FDQN names.The self signed cert has SMTP and is going to expire in a couple of weeks, This certificate only has the server netbios name, do I need to renew it ?
I have Installed new exchange 2010 SP3 server & using wildcard ssl certificate. Our internal Outlook users are getting Autodiscover.epicentertechnology.com certificate error. We have not done any entry in our local DNS server. I tried to resolve this issue by adding entry on local & public dns server. But no luck.
Hi Paul,Our company has one 2010 Exchange on 2008 R2 server. I have setup another exchange 2010 on 2012R2 server. Do I need to use different names for the SSL SAN, then assign the cert? Then move all the mailboxes over to the new server. Do you have a write up on how to have both servers up until migrating over to the newer OS? I was told I cannot just upgrade the 2008 R2 to 2012 R2 when you have exchange installed. Is this true?
I am running an Exchange 2010 server (with all roles) which I am in the process of migrating to Exchange 2016 on a new VM. The self-signed certificate on the Exchange 2010 server is due to expire very soon! It only has the SMTP service assigned to it. I am also using a third party SAN certificate on both of my other servers with the IIS, IMAP and SMTP services assigned to it.
I already purchase single domain SSL certificate (webmail.domain.com) on exchange 2010,and then I figured there was something missing, which is autodiscover.domain.comCan I add another domain to the same certificate ?or Can I add another certificate in the same server ?
I do have a question though, we have found that the SSL cert that is auto created when installing Exchange 2010 is going to expire soon. We have a setup of CAS/HUB roles on one server, and mailbox role on a different server. Question is, do I even need the SSL cert on the mailbox server or can I just remove it? Is it used for anything? It looks to be configured as the cert being used in our RPCwithCert directory in IIS but is that even used?
I have a single server deployment of Exchange 2010. I initially published OWA, ActiveSync, etc. via an ISA 2006 proxy. I have since moved to using a UAG 2010 server to publish these services. On the UAG I am using a wildcard certificate, but I have a SAN cert installed on my Exchange 2010 box. My SAN cert on the Exchange 2010 box is expiring and I was hoping to use the wildcard certificate to replace it.
This article describes how to manage namespaces for Exchange 2013 CAS services. It also applies to Exchange 2010 except that round robin DNS is not a workable solution for Exchange 2010 (but split DNS is) and the configuration for Outlook Anywhere has slightly different steps.
My situation is that I am adding a 2nd Exchange 2010 server into our organization. When I go through the adding cert steps it is including cert names already installed into the first 2010 server. Our scenario:
1st Ex 2010 Server is in a child AD domain: server-name.child-domain.com includes child-domain certs as well as root domain certs listed such as autodiscover.root-domain.com. Cets installed are UC/SAN.
Dear paul I inhereited the following serversI have the following topology.two network load balanced server with the following roles :hub and castwo clustered servers with the following roles mailboxoperating system :windows server 2008 R2apllication:exchange 2010 sp1two domain controller in the same siteone of them is additionalI have a certificate called B-cer which is chained from certificate called A-cert ,the B-cert is the used certificate in exchange 2010 and I got it from internal certificate authority ,also A-cert is obtained from the same internal certificate authorityA-cert will expire on September 2013 and b-cert will expire on October 2013If A-cert is expired at September this will certainly affect the B-cer certificatewhat I have to do,to renew the certificate for exchange 2010 2ff7e9595c
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