SabarnaDeb
3 Argentium

unable to connect to server: Remote system error - connection refused

Hi All,

When i am adding clients through "Client Backup Configuration" getting error message :"unable to connect to server: Remote system error - connection refused". Client server is there behind firewall. Need Help.....

Sabarna Deb

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11 Replies
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EMChangalrai
1 Copper

Re: unable to connect to server: Remote system error - connection refused

check with firewall (Security team)

the ports should be open "Service ports: 7937-9936 "

try this command from both ends rpcinfo -p <client name>

from networker server and client.

the above port range should be open to get success.

let me know the status.

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SabarnaDeb
3 Argentium

Re: unable to connect to server: Remote system error - connection refused

Still i am getting same error.

rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused

We reconfigured NetWorker Portmapper. Opened 7939 to 9936.

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ble1
6 Indium

Re: unable to connect to server: Remote system error - connection refused

Sabarna_Deb wrote:

rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused

We reconfigured NetWorker Portmapper. Opened 7939 to 9936.

You missed 2 most important ports in NW universe - 7937 and 7938.

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SabarnaDeb
3 Argentium

Re: unable to connect to server: Remote system error - connection refused

Sorry, typing mistake. This two ports is also included.

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ble1
6 Indium

Re: unable to connect to server: Remote system error - connection refused

In that case 2 things are happening:

- nsrexecd is not running

- something is still blocking comunication

If later one, then you can easily see that using telnet.  Do following:

- from backup server to telnet <client name> 7937

- from client do telnet <backup server> 7937

This will verify if you are able to communicate with these boxes.  Alternatives:

- from backup server do:

rpcinfo -t <client name> 390113 1

- from client do:

rpcinfo -t <server name> 390113 1

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SabarnaDeb
3 Argentium

Re: unable to connect to server: Remote system error - connection refused

Below error i am getting from backup server to client but from client, it is taking very long time.

rpcinfo: RPC: Remote system error - Connection refused

program 390113 version 1 is not available

Di need to open 111 on firewall??

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AQMDS
1 Copper

Re: unable to connect to server: Remote system error - connection refused

thanks, I checked  nsrexecd services was not running.  after running the service backup running fine.

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singhmridul
1 Copper

Re: unable to connect to server: Remote system error - connection refused

what is the port settings on the firewall. say you have configured service ports range from 7937-9936 on the networker client, but how many ports are configured to allow the communication on the firewall. To make it simple, in a firewall enviornment it is best to open the required number of ports, rather than opening the entire port range. (opening the entire port range beats the purpose) of having a firewall

You may try setting the following:

1. delete the nsr peer information for the client (both client and server)

2. Configure the service ports range on the client from 7937-7947

Ensure that the same ports are opened on the firewall(TCP/UDP bi-directional) and then try to run the wizard.

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SabarnaDeb
3 Argentium

Re: unable to connect to server: Remote system error - connection refused

I have configured the Ports bi-directionally on Firewall and Clients based on below calculation.

Number of Ports = 12 + 2*number of drives+ number of Tape Library = N no. of ports need to be open.

Services port range: 7937 to (7937+N) - Need to be open on firewall and Clients and no need to configure connection port(0-0) on clients.

Command: nsrports -S 7937-(7937+N) on clients and restart the networker client services.

Refer Example A: Calculate service ports on a bidirectional firewall Pg-11 from Configuring TCP Networks and Network Firewalls for EMC NetWorker.PDF

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