Red Hat Bugzilla – Bug 1291699
VMRC fails with firefox browser in Linux OS with the error "Unable to connect to the MKS: Failed to connect to server <server>:<port>"
Last modified: 2016-07-26 11:28:52 EDT
Cannot reproduce this per  (the BZ this was cloned from). I recommend retesting to verify connectivity in tandem with the original BZ.
 - https://bugzilla.redhat.com/show_bug.cgi?id=1240917#c8
Working fine .
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.