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This article shows how to verify and test the automatic sign-in behavior of various Lync clients in an environment by showing the different client behavior and comparing the Windows client to the Windows Store app. Changes to guidance and deployment practices surrounding the Autodiscover service are also discussed.
Behavior In order to observe this behavior simply run a network capture on a workstation running the Lync client and then attempt to sign-in using a bogus SIP domain name. As each autodiscover step fails to receive a suitable response the process will advance to the next logical step.
The following test scenario uses Wireshark but the same process can be used with other network packet capture utilities.
Monitor the Wireshark window while the Lync client is attempting to sign-in and notice each type of DNS record which is resolved and the resulting failure. As long as the test domain name selected is in fact fake and not actually configured for Lync then the entire process should fail, resulting in the following error.
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Use the following query in the Wireshark filter field to display only the DNS queries themselves, hiding all other traffic from the capture window. The results above clearly show that the new order of preference for the Lync Windows client is to leverage the Lync Discover service which was first introduced in Lync Server CU4 for supporting the Mobility clients.
This record should only be available to hosts with acesss to the internal DNS servers, so external clients not connected via VPN should typically receive no response for this query and then move on to the next.
The Lync Windows Store app actually stops here as shown in the next section and does not advance further, hence the requirement for deploying the Lync Discover service correctly even if mobility client are not planned for support in an environment. In the event that none of the records above successfully return a query the last attempt is to sipexternal.
This record is rarely used in real world deployments. The sign-in attempt should fail much quicker than in the previous example. Stop the Wireshark capture and review the results.
In this capture the only DNS queries performed by the MX client were for the pair of lyncdiscover and lyncdiscoverinternal host records. There are no attempts to resolve the legacy SRV and A records which are used by the normal Windows clients. Previous Guidance When the Mobility clients were launched late last year for Lync Server the new Autodiscover service was initially perplexing.
The solution seemed like a lot of work just to support a unique set of clients, both for the product team to develop and for customers to understand and deploy correctly. These new solution seemed to foreshadow additional changes in future clients as well. Now that Lync Server is available and there are at least two new clients now which also leverage this service it is becoming more clear that the new autodiscover approach will be the primary, and eventually maybe the only approach for Lync clients to locate servers to connect to.
The impact of this phased change will mean a few best practices will need to be updated and the reliance on reverse proxy solutions for external web services publishing may become nearly a requirement versus a recommendation in some scenarios.
The most immediate impact is to previous guidance for the Autodiscover service configuration which was originally designed specifically for mobility clients.
The inherent problem seen during these initial deployments is that the large majority of environments utilize a private CA for certificates issued directly to internal Lync servers but now a large amount of unmanaged Lync clients were connecting to Lync directly from internal networks: Previously the majority of clients which would typically connect via an internal network would be domain-joined Windows workstations which would already have the private CA certificate chain provided via Group Policy when an Enterprise Windows CA was paired with the Active Directory environment.
But the mobility clients do not automatically download certificates so if the certificate presented by the Front End or Director servers is not trusted then the clients are unable to establish a TLS connection preventing their use.
The resolutions provided for this issue were either to deploy the needed certificates to all devices a potential device management headache or to instead redirect the internal lookup requests from these devices out to the externally published Lync services which would traditionally contain a third-party public certificate which these devices would already trust by default.
The latter approach is what became more common as it was easier to manage and only impacted the mobile clients. Internal clients and those on VPN in some cases would be directed to internal servers and clients on the Internet would be directed to the external servers. In the scenario above this would mean that internal Lync clients would be redirected out to the reverse proxy and treated like external clients which is not a desired behavior.
Thus the autodiscover DNS records would need to be realigned to their proper locations with Lyncdiscoverinternal existing only in the internal DNS zones and pointing to the internal Front end or Director, while the Lyncdiscover record would on;ly be published in external DNS zones and be pointed to a Reverse Proxy server.
Updated Guidance As these changes are new and there are still a very limited number of Lync Server deployments in production to date it is not realistic to define a new best practice at this point in time. Instead alternative configurations can be investigated and over time one or more of these scenarios may take root in the field as best practices.
Additionally Microsoft may release updated documentation or articles with an official stance on what is recommended. But for now the existing TechNet documentation does not provide any real solution for these potential problems.
Split-Brain DNS The first solution would be to simply start issuing public certificates to the internal Lync servers but this approach may not work for all environments as many third party certificate authorities will not allow certificate requests which contain internal-only domain names.
In networks were Split-Brain DNS is employed then this should not be an issues as all namespaces in use both for servers and SIP domains are publically resolvable and can be verified by the CA as owned by the requestor. In these organizations the simplest approach would be to configure the lyncdiscoverinternal record in the internal DNS zone, pointing to internal Lync servers.
Then publish the lyncdiscover record in the external DNS zone, pointing to a reverse proxy or other web publishing solution. In light of new details the guidance in this section is no longer valid.スレッド 返答 最新の投稿 alphabetnyc.com の XMLに読み込みにおいての文字化け: 2: /02/19 [alphabetnyc.com][VS]alphabetnyc.comhで例.
May 12, – Version Added the ability to configure the maximum file upload size allowed for the File Manager. Updated the Retrieve Email task to remove unsupported forward slash characters from file attachment names .
The US-CERT Cyber Security Bulletin provides a summary of new vulnerabilities that have been recorded by the National Institute of Standards and Technology (NIST) National Vulnerability Database (NVD) in the past week. The NVD is sponsored by the Department of Homeland Security (DHS) National Cybersecurity and Communications .
NOTE: If a realm is configured with an AUP, login attempts from tunnel clients older than version will fail. Users must upgrade their client to version or better to connect. If tunnel client auto-upgrades are enabled in the AUP realm users will be unable to connect to upgrade.
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