WA
As a workaround we need to update this certificate manually. Here are the steps that need to be done in TG box.
DOWnload the identrust certificate from:
https://www.identrust.com/support/downloads
1. Place the Identtrust certificate file in the folder below.
# cd /home/tguser/CSCOSchtg/tg/resources/security/
2. Run the below command in same file path to update certificate
# ../../../_jvm/bin/keytool -import -file IdenTrust-RootCA.cer -alias idtrCA -storetype JKS -storepass "123456" -keystore lb-truststore.jks
3. Restart TG service and check backend connectivity.