Which mean that for *some* reason the Linux kernel doesn't understand packets going out of a process, and drops them.
13:15 mobrovac@deploy1001: Started deploy [restbase/deploy@38c313d]: Expose RB on both 7231 and 7233 - T223953
Deploying the matching iptables policy didn't solve the issue.
I don't know Restbase so I can't tell if it's causing any prod issue, but it's the sign of something wrong going on (bug in restbase?) and should be addressed.