Are you unable to visit site cos of your connection is not private.Here is how to fix “Your connection is not private” error message in Google Chrome. Internal DNS and Exchange Autodiscover. The Issue. By now, anyone who has managed, deployed, or worked with an Exchange 2. ![]() ![]()
Autodiscover. If you aren’t yet, I’ll give a short Explanation of what it is and how it works. Autodiscover is a feature that allows any Mail Client that supports Autodiscover to configure the appropriate server settings for communication so you don’t have to input everything manually. It’s very handy. Unfortunately, you can end up with a lot of headaches related to Autodiscover when you start having to deal with Certificates. The issues you may run into are specifically limited to Exchange Organizations that have a Domain Name that uses a non- public TLD like domain. On an unrelated note, this is one of the reasons that Microsoft has started recommending the use of Public domain names for Active Directory domains. If you have a domain that isn’t publicly useable on your Exchange AD environment, you will run into certificate errors when mail clients use Autodiscover. This becomes particularly problematic when you use Exchange 2. HTTPS for Outlook Anywhere. This is because Microsoft is now enforcing certificate validity with Exchange 2. Autodiscover features (Note, though, that Outlook Anywhere will be configured to use HTTP only when your Exchange Server certificate is determined to be invalid in Exchange 2. With Exchange 2. 00. Certificate error every time you open Outlook. Generally, this error will state that the name on the certificate is not valid. The Cause. To solve the issue with certificates, you need to configure your environment so it enforces the appropriate action with Autodiscover. By default, Autodiscover will attempt to communicate with a number of URLs based on the Client’s email address (for external users) or domain name (for internal users). It will take the following pattern when checking for Autodiscover services: 1. Autodiscover will attempt to find the Autodiscover configuration XML file at the domain name of the SMTP address used in configuration (because internal domain computers configure themselves automatically by default, this matches the Internal Domain. For example, the first place autodiscover looks is https: //domain. Autodiscover/autodiscover. Change domain. com with domain. Exchange looks for on Internal clients. If the autodiscover record is not found at domain. Autodiscover/Autodiscover. This is why the typical recommendation for having an A Record for Autodiscover in your DNS that points to the mail server exists. In addition, you would need to have autodiscover. SAN on the SSL certificate installed on the Exchange server for it to be valid when attempting to connect to autodiscover using this step. If autodiscover information cannot be found in either of the first two steps, Exchange will attempt to use a Service Locator record in DNS to determine the appropriate location of the configuration files. This record points the Autodiscover service to a specific location for getting the configuration it needs. Because of the way this works, there is some configuration necessary to get Autodiscover working correctly. This usually involves adding Subject Alternate Names to the SSL certificate you use for your Exchange Server to allow the many host names used to be authenticated with the certificate. The problem lately, though, is that many Third Party Certificate Authorities that provide SSL certificates are beginning to deny requests for Subject Alternate Names that aren’t publicly available (There are valid security reasons for this that I won’t go in to in this post, but maybe later). As a result, you won’t be able to get a valid SSL certificate that allows domain. SAN. This means that the automated steps Exchange uses for Autodiscover configuration will always fail on an Internal domain with a name that is not publicly accessible or not owned. The Solution. IMPORTANT NOTE: This particular solution only applies to computers on your network that are *not* added to the domain. Domain- joined computers have a different solution to work with. Please read my article on resetting the Active Directory SCP for resolving Autodiscover issues like this on domain- joined computers. There are actually two ways to solve the certificate issues, here. The first would be to prevent Outlook from automatically entering a user’s information when they create their profile. This will result in more work for you and your users, so I don’t recommend it. The other solution is to leverage that last step of the Autodiscover configuration search to force it to look at a host name that is listed on the certificate. This is actually fairly simple to do. Follow these steps to configure the Service Locator record in your internal domain. Open the DNS manager on one of your Domain Controllers. Expand out the management tree until you can see your Internal Domain’s Forward Lookup Zone. Click on it, and make sure there are no A records for autodiscover. Once no autodiscover A records exist, right click the Zone name and select Other New Records. Select Service Location (SRV) from the list. Enter the settings as shown below: Hit OK to finish adding the record. Once the SRV record is added to the internal DNS zone, Outlook and other autodiscover clients that attempt to configure themselves with a domain. SMTP address will work properly without the Certificate errors on all versions of Exchange. Other Nifty Stuff. There are some additional benefits to utilizing the Service Locator record for Autodiscover rather than an Autodiscover A record, even in your public domain. When you use a SRV record, you can also point public clients to communicate with mail. This means you can get away with having a single host name on your SSL certificate, since you wouldn’t need autodiscover. Since most Third Party CAs charge a bit more for SANs than they do for Single Name SSL certs, you can save a bit of money (for this to work, though, you may need to change your Internal and External Web Services URLs in Exchange to match the name you have configured). Another Problem the SRV record Fixes. There are also some other issues you may run into that are easily fixed by adding a SRV record. One of the most common is the use of multiple Email Domains in a single Exchange Environment. If you have users that are not assigned a Primary or secondary SMTP address that matches the domain name listed on your SSL certificate, you’ll discover that those users and the rest of your users will not be able to share calendar data between their mailboxes. You can fix this by adding an Autodiscover SRV record to the DNS zone that manages the additional mail domains. For example, you have domain. Exchange Server. user@domain. The fix for this is to add the SRV record to the domain. DNS zone and point it to the public host name for domain. Once that’s done the services that operate the calendar sharing functions will be properly configured and both users will be able to share calendars. R2 SSL inspection "This server supports weak Diffie- Hellman (DH) key exchange parameters. Grade capped to". I'm trying to secure a 2. R2 IIS server. Running IIS 8. We have our SSL applied to the site. When I run test against ssllabs. I get the above response. I've read through their links on what we need to "disable support for export cipher suites and use a 2. Diffie- Hellman group". I think I have disabled the exportation of cipher group(not really sure) : -( Have no luck on finding layman instructions on creating a 2. SSL and applying to this server. Any simple, layman instructions is greatly appreciated.
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