Hello @Usman0786
I didn't know about your environment (What is the Aria version & other information). According to your text, I can collect below information which will be helpful to renew your Aria expired certificate. Please find below VMware Reference article which can guide you on "Internal Certificate Expired" issue. There is YouTube video in the same article for more information.
This article applies to "VMware vRealize Operations Manager 6.x, VMware vRealize Operations Manager 7.x & VMware Aria Operations 8.x)
Replace expired internal certificate in Aria Operations
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