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SDL Live Content - error message 'Sequence contains no elements'

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Information

 
Article TypeSolution Article
Scope/EnvironmentInfoshare STS Architect server errors on connection
Symptoms/Context
After installing LiveContent, you receive the message Sequence contains no elements
  1. Open the webpage for LiveContent
  2. Session is being forwarded to the STS
  3. Either a ErrorPage 500 appears or Sequence contains no elements error is thrown
Resolution
  1. Open IIS and check which certificate is used
  2. If a root certificate is used,  go to the section Root certificate
  3. If no root certificate is used, go to the section Signing Certificate
  4. root Certificate: 
Root Certificate:
  1. Export the root certificate, if not already done, to a temporary location.
  2. On your keyboard press the key combination:  Windows Key + R
  3. In the Run dialogue enter: MMC  and press OK
  4. Point to File > Add/Remove Snap-in
  5. Choose Certificates and click Add
  6. Select Computer account and click Next
  7. Make sure that Local Computer is selected and click Finish
  8. In the add or Remove Snap-ins, click OK
  9. Expand Certificates and right click on Trusted Root Certification Authorities
  10. Check if the root certificate has been installed. If not, import the root certificate that was exported in step 1
  11. Signing Certificate
Signing Certificate
  1. Export the signing certificate to a temporarily location.
  2. Repeat step 2 - 8
  3. Expand Certificates and right click on Personal 
  4. Check if the signing certificate has been installed. If not, import the signing certificate that was exported in step 1
Root Cause
The reason why you get this message is because the STS is unable to either find the signing certificate or is not able to validate the signing certificate 
Reference
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