Hello everyone!
Today, I’d like to share a case.
Problem Description
SSH all the NE's from the Primary U2000 server is OK before switch-over but after switching-over the server, it is unable to SSH all the NE's and getting the below error messgae "Network error: Connection timed out". Primary & Secondary servers are loacated in different regions and working in High Availability System (Solaris) network.
Problem Analysis
1. Checked the status of process "PortTrunkingService" in the U2000 system monitor. The clients can access NE's by using this PortTrunkingService.
The process was running.
2. Checked the status of port 22 in the firewall between U2000 servers & NE's.
The port 22 was opened and NE's can be reached from servers itself. But, NE's cannot be SSH from U2000 clients. The issue was narrowed down between clients & server.
3. Asked to Check the status of port 31035 in the firewall between U2000 client & U2000 server.
This port was not opened in the firewall accross the regions. That's why customer was unable to SSH NE's after switching-over the servers.
Reason analysis:
1. Port 22/TCP should be opened in the firewall between U2000 server & NE for STelnet server & SFTP to provide secure Telnet services & secure file transfer using SSH encryption mode.
2. Port 31035/TCP should be opened in the firewall between U2000 Clients & U2000 Server because it's a listening port of the PortTrunkSvc process that provides the proxy function. The client can access NEs by using the PortTrunkingService.
Root Cause
During the handling process, found that communication port 31035 was not opened in the firewall accross the regions between U2000 Clients and U2000 server. As mentioned in the reason analysis, it's a listening port of the PortTrunkSvc process that provides the proxy function. The client can access NEs by using the PortTrunkingService.
Solution Description
Asked customer to open the port 31035 between U2000 clients and server. The SSH issue was resolved after opening the mentioned port.
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