Certificate Validation errors in SharePoint 2013

I got client investigating performance issues – the Portal pages were sometimes taking a very long time to load. Page load times were inconsistent, and the browser would spend a long time “Connecting…”, before content would load on the page. Checking the event logs, we saw a frequent error message:

Error:

A certificate validation operation took 30008.7312 milliseconds
and has exceeded the execution time threshold. 
If this continues to occur, it may represent a configuration issue. 
Please see http://go.microsoft.com/fwlink/?LinkId=246987 for more details.

 I did something similar before and had to generate a cert via powershell. So I done the following in the SharePoint Management Shell:
$rootCert = (Get-SPCertificateAuthority).RootCertificate
$rootCert.Export(“Cer”) | Set-Content C:\root.cer –Encoding Byte

The Certificate file will be saved on the C drive


 Once done I went back into the certificates snap in and imported the certificate into the trusted root certificate authorities. Once done the bulk of the errors disappeared 

Then I added Host entry of the web app port number in that host file entries

Error 1603 installing AppFabric 1.1 for Windows Server 2012

I just uninstall the AppFabric and re-install the installer would run for a while and then error out with the following message:

Issue:

AppFabric installation failed because installer MSI returned with error code: 1603

Solution:

Removing the extra double quote " in the path of PSModules in Environment Profiles helped in solving this issue on Win server 2012

 

App Management Service for Sharepoint 2013 SP Desinger Workflows

I've created SP 2013 simple workflow using SP Designer 2013. I've set up my environment as described in msdn documentation. But when I'm trying to deploy the solution I'm receiving following exception:

Microsoft.SharePoint.SPEndpointAddressNotFoundException: There are no addresses available for this
application.
   at Microsoft.SharePoint.SPRoundRobinServiceLoadBalancer.BeginOperation()
   at Microsoft.SharePoint.Administration.SPServiceApplicationProxyBase`1.ExecuteOnChannel(Boolean
requireDelegation, Action`1 codeBlock)
   at Microsoft.SharePoint.AppManagement.AppManagementServiceApplicationProxy.GetScaleOutDatabaseMap()
   at Microsoft.SharePoint.SPScaleOutDatabaseMap.GetMapCacheEntries

Solution:

Just resolved.

I found following message in ULS:
"There are no instances of the App Management Service started on any server in this farm. Ensure that at
least one instance is started on an application server in the farm using the Services on Server page in
Central Administration."
I went to CA -> System Settings -> Services on server and started App Management Service. Then performed
iisreset and the workflow deployed successfully.