NetWorker: Server nsrexecd cannot start because of TCP connection on port 7938 in state SYN_SENT

Summary: NetWorker Server nsrexecd process cannot start because of a is unavailable TCP connection on port 7938 in stuck in OS in state SYN_SENT after a NetWorker/OS crash. Problem was resolved after rebooting the NetWorker server. Root cause of stuck SYN_SENT connection is not known but seems to be an OS issue. ...

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Symptoms

NetWorker server services fail to start because the underlying client service (nsrexecd) cannot start.
The NetWorker client service nsrexecd cannot start, it exits immediately after starting.
nsrexced -D9 shows that another connection is open on port 7938 which is dedicated to nsrexecd.

Cause

There was a hang TCP connection on the operating system with port 7938:

# netstat -anop |grep -i 7938
tcp6       0      1 ::1:44115               ::1:7938                SYN_SENT    -                    off (0.00/0/0)

SYN_SENT is a transitional state, even difficult to catch and it is initial connection request from client to server. 

NetWorker Processes and Ports

Resolution

  1. Ensure optimized kernel, and TCP parameters are configured on the NetWorker server: NetWorker: Best practices for networking configuration
  2. Reboot the host. 
NOTE: This is not a NetWorker issue. If this issue reappears or root cause of the SYN_SENT hang is required, consult with the system administrator or OS vendor support team.

Affected Products

NetWorker

Products

NetWorker Family
Article Properties
Article Number: 000184674
Article Type: Solution
Last Modified: 06 Jan 2026
Version:  1
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