admincenter and test the connectivity Warnning
13 views (last 30 days)
Show older comments
Unable to identify the problem
Matlab is working fine but these warnings are not resolved by the application. When i use admincenter and test the connectivity the following warning occurs
Kindly Guide Me How To Fix It
ID # Start Time Stop Time Executing Node Subject Node Test Category Test Description Result Message
1 Sep 19, 2012 7:26:48 PM Sep 19, 2012 7:26:50 PM ac2-pc ac2-pc PORT_CONNECT PingServerSocketHost Test SUCCESS
2 Sep 19, 2012 7:26:48 PM Sep 19, 2012 7:26:50 PM aclp2 ac2-pc PORT_CONNECT PingServerSocketHost Test *WARNING Host AC2-PC does not respond to java.net.InetAddress.isReachable(). *
3 Sep 19, 2012 7:26:49 PM Sep 19, 2012 7:26:52 PM ac2-pc aclp2 PORT_CONNECT PingServerSocketHost Test *WARNING Host ACLP2 does not respond to java.net.InetAddress.isReachable(). *
4 Sep 19, 2012 7:26:52 PM Sep 19, 2012 7:26:52 PM ac2-pc aclp2 PORT_CONNECT ConnectToServerSocket Test (remote port 27355) SUCCESS
5 Sep 19, 2012 7:26:53 PM Sep 19, 2012 7:26:53 PM ac2-pc ac2-pc PORT_CONNECT ConnectToServerSocket Test (remote port 27355) SUCCESS
6 Sep 19, 2012 7:26:53 PM Sep 19, 2012 7:26:54 PM aclp2 ac2-pc
0 Comments
Answers (5)
Jason Ross
on 20 Sep 2012
You have a name resolution problem.
You need to check and possibly modify:
Firewall settings (if firewalls are in use)
DNS records (forward and reverse lookup)
DNS search domains
For each of the problematic hosts.
I can't tell you any exact fixes because you don't indicate what operating systems are in use, and these settings may or may not be accessible to you -- you will likely need root/Administrator privileges to change them. These settings can also vary widely by site, as well -- so you might need to contact networking staff (if you have them) to get the proper settings to make it work.
Please open new questions. Don't add on to existing ones that have been resolved for some time.
0 Comments
leo
on 21 Sep 2012
3 Comments
Jason Ross
on 21 Sep 2012
Edited: Jason Ross
on 21 Sep 2012
Leave the firewalls off until you get the DNS stuff figured out.
If you are using hostfiles, make sure that the above tests work with the short hostname and fully qualified one both ways.
Also, ensure that the NetBIOS setting is as you expect. It's a second level of name resolution beyond DNS, and it can add another place for the names to be inconsistent.
I would also make the assumption that both machines are on the same subnet as well as (likely) the same switch? Or are there other things on the network between the two hosts?
For port blocking, you can check with netstat -a and use "<matlabroot>\toolbox\distcomp\bin\nodestatus -infolevel 2" to see more information. But you must get the name resolution items down before you move on, as they are the foundation things build on.
Also, be on the lookout for multiple NICs where you might not expect them -- for example if you are on a laptop with a wireless connection and a wired connection -- that can cause confusion, especially if there is a duplicate hostname out on the network and it gets resolved first, since I think Windows favors a DNS response over the hosts file.
leo
on 25 Sep 2012
Edited: leo
on 25 Sep 2012
1 Comment
Jason Ross
on 25 Sep 2012
You will need to populate the hosts file with the ip addresses and hostnames in the ways they will be addressed. According to Microsoft, this is one entry per line. So you would need these entries in the file. Make sure to use the same file on both PCs.
192.168.0.8 AC2-PC
192.168.0.8 ac2-pc
192.168.0.8 AC2-PC.YOURDOMAIN.COM
192.168.0.8 ac2-pc.yourdomain.com
192.168.0.11 ACLP2
192.168.0.11 aclp2
192.168.0.11 ACLP2.YOURDOMAIN.COM
192.168.0.11 aclp2.yourdomain.com
Note that the hostnames above are case-sensitive!!!! Were I doing this, I would keep everything lower-case, as is Internet convention. You also need to be sure that in DNS, the "Use hosts file for name resolution" is checked, to ensure that these names are resolved. You also need to replace "yourdomain.com" with the DNS domain settings for your network.
192.168.0.1 is by convention the preferred gateway for a network -- but that's a convention. You need to confirm it with the people who run your network.
DNS is another setting that is per-network. You need to check with the people who run your network what the DNS Server(s) should be set to. I have no way of knowing.
The bottom line here is that you need to get the network working properly. Right now it's not working properly, and you really need to reach out to people who understand how the network you are running on is configured, as correct hostname resolution is an absolute requirement for any clustered system to work.
leo
on 2 Oct 2012
9 Comments
Jason Ross
on 3 Oct 2012
And you are already up and running ... it's just fiddling with the firewall settings that's tripping you up a bit. Once you get that figured out you are good to go.
See Also
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!