GitHub user Yser2025 added a comment to the discussion: Open file from console
Thanks, I solve problem!
```
$ od --endian=big -N 4 -i ~/.netbeans/27/lock
0000000 36049
0000004
$ ss -lnp | grep 36049
tcp LISTEN 0 50 [::1]:36049
[::]:* users:(("java",pid=837639,fd=24))
$ curl localhost:36049 -v
* Trying 127.0.0.1:36049...
* connect to 127.0.0.1 port 36049 failed: В соединении отказано
* Trying [::1]:36049...
```
My firewall for ip v4 is clean and not for ip v6. But Netbeans listen ipv6 by
default...
```
$ sudo ip6tables-save
# Generated by ip6tables-save v1.8.9 (nf_tables) on Thu Nov 13 08:41:35 2025
*filter
:INPUT DROP [171072:31931912]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [1548:165484]
COMMIT
# Completed on Thu Nov 13 08:41:35 2025
```
I allowed connections within localhost and the hook started working again:
```
$ sudo ip6tables-save
# Generated by ip6tables-save v1.8.9 (nf_tables) on Thu Nov 13 08:43:17 2025
*filter
:INPUT DROP [23:4485]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [1588:168563]
-A INPUT -s ::1/128 -d ::1/128 -j ACCEPT
COMMIT
# Completed on Thu Nov 13 08:43:17 2025
```
GitHub link:
https://github.com/apache/netbeans/discussions/8983#discussioncomment-14953421
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