Technical-informations.md

@@ -78,3 +78,16 @@ The host for artemix ( artemix.obspm.fr ) and yafits ( artemix.obspm.fr/fits ).
 # House cleaning
 The execution of YAFITS servers generates a lot of temporary files amongst which are the FITS files generated a
 
+# Network considerations
+
+## Open a port
+Example :
+```
+[caillat-adm@juliette ~]$ sudo sudo firewall-cmd --zone=public --permanent --add-port=3023/tcp
+[sudo] Mot de passe de caillat-adm : 
+success
+[caillat-adm@juliette ~]$ sudo firewall-cmd --reload
+success
+```
+
+to add the port 3023 and have it available immediately.
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