Caused by: com.aveksa.common.ConnectException: Connection failed
    at com.aveksa.common.http.client.RSAHTTPClient.execute(RSAHTTPClient.java:120) ~[common.jar:?]
    at com.aveksa.client.genericrest.authenticationManager.TokenBasedDynamicAuthenticator.fetchToken(TokenBasedDynamicAuthenticator.java:63) ~[generic-rest-client.jar:?]
    at com.aveksa.client.genericrest.authenticationManager.AuthenticationManager.fetchToken(AuthenticationManager.java:44) ~[generic-rest-client.jar:?]
    at com.aveksa.client.genericrest.authenticationManager.TokenBasedAuthenticationManager.getToken(TokenBasedAuthenticationManager.java:139) ~[generic-rest-client.jar:?]
    at com.aveksa.client.genericrest.authenticationManager.TokenBasedAuthenticationManager.updateAuthenticationConfigurationInRequest(TokenBasedAuthenticationManager.java:63) ~[generic-rest-client.jar:?]
    at com.aveksa.client.genericrest.GenericRESTClient.executeCollection(GenericRESTClient.java:217) ~[generic-rest-client.jar:?]
    at com.aveksa.collector.generic.rest.adc.GenericRESTAccountDataIterator.collectAccountData(GenericRESTAccountDataIterator.java:158) ~[classes/:?]
    at com.aveksa.collector.generic.rest.adc.GenericRESTAccountDataIterator.next(GenericRESTAccountDataIterator.java:68) ~[classes/:?]
    ... 13 more
Caused by: javax.net.ssl.SSLHandshakeException: No X509TrustManager implementation available

The error is happening because java TrustStore found at ${JAVA_HOME}/jre/lib/security/cacerts file is found to be empty.

This indicates Java is unable to validate trusted certificates. The Java JDK could be installed incorrectly (likely installed with the wrong Unix account or wrong sudo command) and has replaced the current cacerts with an empty file and backed up the previous one:

${JAVA_HOME}/jre/lib/security/cacerts file needs to be restored manually after the upgrade if this problem is encountered.

It can be restored from the backup "cacerts.1719000895 in the above screenshot" by copying it over the empty "cacerts".
It can also be restored/replaced from another environment (or from any other backup if available).