Windows master unable to connect to jvms on Linux systems; Config issue?

Question

I have a Win2K12 system set up as an admin server to start a workload on slave systems which are dual-booting Win2K12 and RHEL7. This works fine for the Win2K12 setup, but as I move on to the NFS testing, I run into problems connecting to the Linux hosts.
This SMB workload file, run from the Win2K12 admin server pointing at Win2K12 workers works fine:
compratio=2.0,dedupratio=5,dedupunit=4k
hd=r710-01,system=r710-01.storage.spoc,user=administrator,shell=vdbench
hd=r710-08,system=r710-08.storage.spoc,user=administrator,shell=vdbench
sd=sd1,host=r710-01,lun=Z:\test1.txt,threads=32,size=50g
sd=sd8,host=r710-08,lun=Z:\test8.txt,threads=32,size=50g
wd=wd1,sd=(sd1,sd2,sd3,sd4,sd5,sd6,sd7,sd8),xfersize=4k,rdpct=25,seekpct=100,openflags=directio
rd=run1,wd=wd1,iorate=(250,500,750,1000,max),elapsed=600,interval=5
This test NFS workload file does not:
compratio=2.0,dedupratio=5,dedupunit=4k
hd=r710-08,system=r710-08.storage.spoc,vdbench=/mnt/nfs/vdbench/vdbench,user=root,shell=vdbench
sd=sd1,host=r710-08,lun=/mnt/nfs/test8.txt,threads=32,size=50g
wd=wd1,sd=(sd1),xfersize=4k,rdpct=100,seekpct=100,openflags=directio
rd=run1,wd=wd1,iorate=(250,500,750,1000,max),elapsed=600,interval=5
IPTables is stopped, and the vdbench rsh daemon is running on R710-08. I've verified that I can start vdbench locally on R710-08 and run it against the NFS mount. I've tried it with the vdbench path set properly for the Windows admin host (C:\vdbench\) and properly for R710-08 (above), as well as the user set to "Administrator" and "root", but in no case can I get it to successfully connect. In all cases, I get this or similar:
C:\vdbench>vdbench -f linuxtest.txt
Vdbench distribution: vdbench50402
For documentation, see 'vdbench.pdf'.
16:39:59.019 input argument scanned: '-flinuxtest.txt'
16:39:59.097 *
16:39:59.097 * In order for Dedup to remember which data patterns have been written and
16:39:59.097 * which data patterns they can be replaced with, Dedup has activated a
16:39:59.097 * subset of Data Validation. Data Validation will only be used to keep
16:39:59.097 * track of data patterns. It will not be used to validate data, unless
16:39:59.097 * of course specifically requested.
16:39:59.097 *
16:39:59.144 Starting slave: C:\vdbench\vdbench SlaveJvm -m 10.241.6.23 -n r710-08.storage.spoc-10-150309-16.39.58.972 -l r710-08-0 -p 5570
16:40:09.222 Waiting for slave connection: r710-08-0
16:40:19.395 Waiting for slave connection: r710-08-0
16:40:20.161
16:40:20.161 Trying to connect to the Vdbench rsh daemon on host r710-08.storage.spoc
16:40:20.161 The Vdbench rsh daemon must be started on each target host.
16:40:20.161 This requires a one-time start of './vdbench rsh' on the target host.
16:40:20.161 Trying this for 60 seconds only.
16:40:29.568 Waiting for slave connection: r710-08-0
16:40:39.740 Waiting for slave connection: r710-08-0
16:40:46.194
16:40:46.194 Trying to connect to the Vdbench rsh daemon on host r710-08.storage.spoc
16:40:46.194 The Vdbench rsh daemon must be started on each target host.
16:40:46.194 This requires a one-time start of './vdbench rsh' on the target host.
16:40:46.194 Trying this for 60 seconds only.
16:40:49.913 Waiting for slave connection: r710-08-0
16:40:59.210
16:40:59.210 Terminating attempt to connect to slaves.
16:40:59.210
java.lang.RuntimeException: Terminating attempt to connect to slaves.
        at Vdb.common.failure(common.java:306)
        at Vdb.ConnectSlaves.connectToSlaves(ConnectSlaves.java:99)
        at Vdb.Vdbmain.masterRun(Vdbmain.java:730)
        at Vdb.Vdbmain.main(Vdbmain.java:577)
Bottom line - Is the Windows/Linux mixed environment thing going to work? If so, what am I missing? If not, I need to give up and move on with creation of a second (RHEL7) admin server.
Re-formatted for clarity. - Mike Baxter

Answer 1

Thanks for the response, Henk. The linux->linux testing produced some more helpful outputs, that allowed me to track down the firewall as the problem. I'd verified that iptables was not running, but I didn't realize that RHEL7 had gone to firewalld...Which was running.
It now works linux->linux, windows->linux, and linux->windows, with appropriate workload files.
This is a semi-static environment intended to be provided to not always very technical users for proof of concept duties, so most of my control necessarily is centralized on a Win2K12 VM. The systems generating the load will be between 1 and 8 physical systems and up to two dozen VMs running Win2K12 or RHEL7, while the workloads will usually be all Windows or all Linux, the "semi-static" nature means I've got to be able to run both concurrently.