A new patch update is available for Cm1 5.3 SR1. This rollup patch includes a minor update to TLS support introduced the prior patch that resolves a problem with the HTTPS connector in CM1 and includes the newer GCM ciphers by default that Chrome prefers for TLS.
The patch release notes can be found on the help site:
The Patch can be downloaded from the Support portal:
Let us know if you have any questions,