- Skype For Business Mac Date Time Certificate Error Code
- Skype For Business Certificate Error Mac
- Date Time Sd
Howdy,
It has been a while since my last “Simple Understanding” article, so as the year getting to an end, I decided to address a topic that is already address before in many great blog articles, but hay… you know me, it is important to me that my followers and readers can have everything they look for in my blog as well as I’m addressing this topic, and as I always do with my simple understanding series, I will be using non-technical words as much as I can, easy to understand phrases and explanation and of course videos shows the flow under the hood, so let’s get cracking ?
'Cannot sign in to Skype for Business because your computer clock is not set correctly. To check your computer clock settings, open Date and Time in the Control Panel.' Solution Per KB2581291 Microsoft suggests to make sure that the computer's clock and time zone settings are set correctly. And it's correct article except the fact that the. Download Skype for your computer, mobile, or tablet to stay in touch with family and friends from anywhere. This site uses cookies for analytics, personalized content and ads. By continuing to browse this site, you agree to this use.
In this article I will revisit the Autodiscover and Authentication process of the Skype for business clients. Avast anti track premium indir. Will start with explaining how SkypeFB client locate the frontend, then moving forward will explain the Authentication process, this will be very handy for you when troubleshooting.
Skype4b Client – Locating the Frontend
So let us say that a new Employee joined the company, got his/her new company’s laptop and sitting in the office, fired it up and started Skype for business client, wrote the SIP-address and password and clicked “Sign-In”, now what? What is happening in the background? Following video shows a step by step of the discovery mechanism that Skype for business client conduct to locate the frontend.
Skype for business client autodiscover logic
Note: in real life not all mentioned steps are conducted by the Skype for Business client.
So as you see in the video, the Skype4b client is designed to search for the frontend pool using pre-coded DNS records, it gets the domain name from the user’s sip-address one in red (user@sip-domain) then start adding to it pre-coded values in the following order:
- Lyncdiscoverinternal.sip-domain
- Lyncdiscover.sip-domain
- SRV _sipinternaltls._tcp.sip-domain
- SRV _sip._tls.sip-domain
- Sipinternal.sip-domain
- Sip.sip-domain
- Sipexternal.sip-domain
I did a test using a fake sip-domain to show you the logic in how Skype4b client discover the frontend IP-addresses, following screenshot is taken from MS Network Monitoring tool
When the client cannot resolve the first DNS records it tries the second one, if not then the third if not then…. Well you get the idea ?
Back to our example let’s consider that all your DNS requirements are there, what happens then is because the new employee sitting inside the Corp network, the client will get a response for the lyncdiscoverinternal record and then will contact the frontend pool and authenticate with it.
Locating Frontend inside Corp Network
In case you did not already catch on that, skype4b try to resolve either lyncdiscoverinternal or lyncdiscover which will let the client to know if it is inside or outside the Corp-Network.
Just for your information the second time the user will try to sign-in the client will go directly to the Frontend pool, not going through the whole process again unless it cannot discover the lyncdiscoverinternal or you flushed the DNS.
Skype4b Client – Authenticating
Ok so the Client successfully located the frontend, now comes the fun part, authenticating against the frontend there are a number of scenarios to consider here:
- User inside the Corp-Network using a domain joined laptop
- User Outside the Corp-Network using a domain joined laptop
- User using a non domain joined laptop
before we dig in, understand that Skype for business as well as previous version of Lync uses 3 different methods of authentication:
- Kerberos
- NTLM
- Certificate (TLS-DSK) << most preferred one
User Inside Corp-Network with domain joined laptop:
Game the legend of zelda for mac. P.S I will be using the word “Pool” a lot, and by pool here I mean your frontend or director pool depending on your deployment type.
so this employee we are talking about above is signing in for the first time using the Active directory username and password and the client resolved the lyncdiscoverinternal DNS record successfully, now what?
- Client will try to locate the Auto discover services, the use of the Autodiscover services is to tell the client where is the user is homed, client does that by sending two parallel HTTP and HTTPS GET requests to the Autodiscover services running on the pool and as following:
- HTTP://pool.domain/Autodiscover/AutodiscoverService.svc/?sipuri=user@sipdomain
- HTTPS://pool.domain/Autodiscover/AutodiscoverService.svc/?sipuri=user@sipdomain
- this is a screenshot take by Fiddler for a real life example with office 365
- Client will get back a response with two HTTPS URLs in it
- HTTPS://pool.domain/Autodiscover/AutodiscoverService.svc/root/ domain
- HTTPS://pool.domain/Autodiscover/AutodiscoverService.svc/root/user
- /root/domain URL accessed without need to authenticate and used to get general information about the Topology
- /Root/user URL need authentication and used information about the user’s home pool and frontend.
- Client will try to use the /root/user/ URL to get the info it need about the home pool, but first it will try to authenticate using the AD username and password (NTLM) which will return a 401 Unauthorized and attach the Web ticket services URL in the response for the client to go and obtain a certificate from it.
- another capture of my office 365 traffic
- Client will start talking to the web ticket services running on the pool and try to get a certificate by authenticating using NTLM, the pool will authenticate the user and create a self signed certificate for him/her that is valid for 180 days.
- Client then try again to authenticate with the Autodiscover services to obtain the information about home pool, but this time it will authenticate using the TLS-DSK method (Certificate)
- Client will get a response with where the user’s home pool is.
- Client start communicating to the user’s home frontend and go through step 3-5 again
- Client authenticate successfully and get a response from the Autodiscover services with the information needed in the format of xml, below is a real life capture from my office 365 account
and here is a short video to show the work flow of how authentication works
Skype for business authentication overview
User Outside Corp-Network with domain joined laptop:
External users trying to sign in from outside the Corp-Network using a domain joined machine, lets assume that the user never signed in before and have no certificate from Lync.
Lync uses two method of authentications here:
- NTLM
- Certificate TLS-DSK
assuming that the Lync Edge and the reverse proxy servers are deployed and have no problem the authentication process will be same as scenario one but with the following differences:
![Skype For Business Mac Date Time Certificate Error Skype For Business Mac Date Time Certificate Error](https://i1.wp.com/4.bp.blogspot.com/-5BZ8ikE-zwA/VunFfN1b-wI/AAAAAAAAELM/QwnWcinCH_8qS-2MMqry42UNVo9REZNbA/s1600/login_wrong_2.png?ssl=1)
- Authentication traffic will be proxy via the Edge pool to the Pool (Director or Frontend)
- Skype4b Client will try to authenticate using NTLM, which will return Unauthorized
- Edge will redirect the Client to the external web services URL, this services usually published by the Reverse Proxy
- using NTLM authenticate against the Web services a self signed certificate is issued and stored in the client “Personal Store”
- now back again to proxy traffic via the Edge server, the Skype4b client will authenticate against the pool using TLS-DSK which will work and the user sign-in.
following is a video showing the steps of singing in.
User Outside Corp-Network with none domain joined laptop:
so last scenario is user trying to sign in to Skype for business client on a none domain joined machine, assuming that the machine is not connected to the corp-network because allowing none domain joined machines to the internal corp-Network will be a stupid thing to do for so many reasons I won’t discuss here, so let’s say the user will connect from a guest Wifi or a home which is considered a none corp-Network, the process will be same as scenario two with user and domain joined machines, the authentication traffic will be proxy to the pool via Edge, and then redirected to the Reverse proxy server to obtain and download certificate which will be stored in the personal store on the machine.
the credentials will be saved in the Windows Credentials manager if you choose to save my credentials when signing in to Skype for business.
Skype4b Mobile – Locating the Frontend
Skype for business Mobile and windows Metro app clients are different in the discovery method than normal desktop clients, the Mobile clients try to resolve two DNS records to locate the pool:
- Lyncdiscoverinternal.sip-domain
- Lyncdiscover.sip-domain
as best practice you should always point the lyncdiscover to the reverse proxy of your infrastructure where the services is published using a public SSL certificate, why you ask, because Skype4b mobile and windows app cannot request and download self signed certificate like normal desktop clients, that’s why the public SSL certificate deployed on your reverse proxy is used.
if the Mobile client or windows metro app client cannot resolve those two DNS records, the discover simply fail and user cannot login, the clients won’t fail back to SRV records like in desktop client.
![Certificate Certificate](https://www.citrix.com/blogs/wp-content/uploads/2019/10/Catalina.png)
Skype4b Mobile – Authenticating
Mobile client authentication is very much the same as Scenario one
Skype For Business Mac Date Time Certificate Error Code
that’s all, a quick deep dive into autodiscover and authentication of Skype for business clients, this article if understood can help you troubleshoot future problems with signing in and discovery.
wish you all and your families a very merry Christmas and happy new year.
A list containing the majority of Citrix related Skype for Business and Microsoft Teams support articles collated to make this page a one stop place for you to search for and find information regarding any issues you have with the product and its related dependencies. Reaplugs for mac.
The page is updated daily with new support articles and information. Articles will change from time and if information here is outdated or incorrect please let me know using the comments. Links may also expire or change so if you find broken links, please again let me know. For each issue, known product versions affected are recorded however that does not mean product versions that aren’t listed are not affected.
There is a search box that you can use if looking for a specific fault. For example if you have an error code or error message, use that to perform a search. You can also use your browsers search feature which will perform a search against the whole page based on the words you enter.
Skype For Business Certificate Error Mac
Skype for Business/Microsoft Teams:
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Date Time Sd
wdt_ID | Brief Description of Issue | Brief Description of Fix | Applicable Product Versions Affected (if known) | Link to supplemental Support Article(s) |
---|---|---|---|---|
1 | When using the HDX RealTime Optimization Pack with Philips SpeechMike, you encounter unexpected behaviour such as the SpeechMike freezing, becoming unavailable or exhibiting unwanted behaviour. | This was caused by RTOP querying an unsupported string descriptor and the Philips firmware not handling the request adequately. Upgrade to RTOP 2.3 and Philips SpeechMike firmware version 3.8.380+. | https://support.citrix.com/article/CTX226621 | |
2 | Unable to answer Skype for Business calls by using buttons on the headset or base on a Plantronics Savi headset. | Plantronics Savi requires usage of a wake-up message which was not implemented before. A bug fix 'LC7873' is available from Citrix support. Otherwise this issue has been resolved in RealTime Optimization Pack 2.3. | https://support.citrix.com/article/CTX226081 | |
3 | Moving the volume slider up or down within the Skype for Business options interface does not change the call volume. | Using the Skype for Business options menu to adjust volume only affects future calls and will not change the volume of calls that are in-progress. To overcome this, you can use the volume option available in your meeting window. | https://support.citrix.com/article/CTX225772 | |
4 | You cannot control the volume of a Skype call using the published desktop volume adjustment controls. | When Skype for Business is in optimised mode, the call is running from the endpoint. Use your headset controls or client device to adjust the volume. Citrix is looking to resolve this in future releases. | https://support.citrix.com/article/CTX225223 | |
5 | Users hear an echo under certain scenarios when making a Skype for Business call with HDX Optimization Pack 2.1 or 2.2. | This is a known limitation of the product and whilst the RealTime Optimization Pack contains some functionality for echo cancellation this feature is being constantly improved. | Skype for Business RealTime Optimization Pack 2.1 and 2.2. | https://support.citrix.com/article/CTX221402 |
6 | The RealTime Media Engine may crash when using macOS High Sierra 10.13. | Citrix are currently working on a resolution. | Citrix HDX RealTime Media Engine 2.2.100 and 2.3. | https://discussions.citrix.com/topic/390535-rtme-23-crash-with-high-sierra-1013-release-of-mac-os-x/ |
7 | When trying to redirect a Microsoft LifeCam HD-3000 from a Windows 10 client, you receive message 'We didn't detect a camera' until you perform a reboot. This occurs on VDA 7.6 LTSR. | This is a Microsoft issue and relates to the 'waveOutGetDevCaps' interface taking too long to load. | https://support.citrix.com/article/CTX229630 | |
8 | When a third person joins a conference call, the call is paused. | When you have 3 or more participants in a Skype for Business call, the conference is hosted on a Microsoft Media Server such as Office 365. In this case the third participant's RTOP enabled thin client did not have access to the internet. | https://discussions.citrix.com/topic/395295-s4b-meeting-with-paused-status-with-hdx-optimization-pack-24/ | |
9 | Message notifications do not play such as when a new IM is sent to a user. | Issue is resolved in HDX RealTime Optimization Pack 2.4.1000. | https://support.citrix.com/article/CTX235852 | |
10 | The Skype UI freezes after a video call is established on a Server OS VDA which is hosting 40 to 50 concurrent sessions. | Contact Citrix support to obtain a private hotfix. | Citrix HDX RealTime Optimization Pack 2.4. | https://support.citrix.com/article/CTX235947 |