[Bug]: No buffer space available

[jakubmuransky]

Summary

Hello,
I have the same error on version 1.6.3 and I also tried 1.6.4.
Rolling back to 1.6.1 didn't help #267
I have 3 GWs in docker with same configuration, only one of them have this problem.

2026-03-12T09:54:20.716603Z ERROR core_configuration: defguard_gateway::gateway: message=Interface configuration failed: Firewall error: Netlink error: Failed while reading a message from socket: Os { code: 105, kind: Uncategorized, message: "No buffer space available" } log.target=defguard_gateway::gateway log.module_path=defguard_gateway::gateway log.file=/app/src/gateway.rs log.line=516 [1.6.1+9a724cd Debian 13.0.0 x86_64][C:1.6.4+547d446 Debian 13.0.0 x86_64]

https://docs.defguard.net/support-1/troubleshooting#gateway-throws-no-buffer-space-available-error
Already applied before

Should I create new bug, or where can be the problem ?
Thanks

Steps to reproduce

Expected behavior

gw should start

Actual behavior

gw it's disconnected from the

Defguard version

Core 1.6.4, Gateway 1.6.4/3/1

Environment details

rocky 9.7 + Docker version 29.3.0

Deployment / install method

Docker / Docker Compose

Relevant logs / output

Relevant configuration (redacted)

[jakubmuransky]

Increasing value to
net.core.rmem_default = 16777216
net.core.wmem_default = 16777216
Fixed the problem, it was recommended by AI, I didn't tried the values between

[moubctez]

@jakubmuransky Do have a clue how to reproduce this problem? Are there specific firewall rules, or there are too many of them?

[jakubmuransky]

I'm not sure how, this gateway was less used that "bigger" one which weren't facing the issue, so less rules and traffic via it