How to remove error code 900 in LoL?

My LOL stopped working normally. When I try to enter the in-game store, I keep getting error 900 and it says “Unexpected error code 900”. From such a game did not expect such setups. I hope for your help.


Hello! Judging by what League of Legends fans write on foreign forums, error code 900 is related to certificates. It seems that some certificate has expired and therefore the system is blocking access to the store. You need to forcefully delete it, then the system will reinstall the necessary permissions.

Here’s what has worked for others:

  1. Type mmc into the Run box and press Enter.
  2. We are looking for certificates, files and plugins that have expired.
  3. Remove them or install new ones.
  4. Again, the line “Run” enter certmgr.msc.
  5. Go to the “Trusted Certification Authorities/Certificates” tab.
  6. We remove “DST Root CA X3” from here, since it has expired. Now he often interferes.
  7. Let’s go to the page IdenTrust and download the certificate from here.
  8. We install it in “Trusted Certification Authorities”, and a message about the danger will appear, but there are actually no risks.
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