OFR_104: too many simultaneous connections
Your server opened too many connections to Orange at the same time. Orange recommends no more than two simultaneous connections per sending IP address.
- Orange
- Provider
- Sources checked
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At a glance
- Code
- OFR_104
- Who has to act
- The sender. The fix is on the sending side: your domain, your server or your list.
- What the server says
Trop de connexions, veuillez verifier votre configuration. Too many connections, slow down.
What it means
Orange puts its own code at the end of each rejection, after a prefix that varies: in "OFR002_104" the code is 104, and Orange uses this very message as its example. Code 104 means your server is opening too many simultaneous connections. The Orange postmaster page recommends up to two simultaneous connections per sending IP, 100 messages per connection and 100 recipients per message, and warns that different limits may apply depending on your reputation. Lower your concurrency toward Orange before sending again.
Common causes
- Your server opens many parallel connections to the Orange mail servers.
- Several servers or processes share one IP and connect to Orange at once.
- Your reputation at Orange is low, so a stricter limit applies to you.
How to fix it
- 01Limit your server to two simultaneous connections per IP toward orange.fr and wanadoo.fr.
- 02Send several messages over each connection, up to the 100 per connection Orange recommends.
- 03Once the concurrency is lower, make sure the refused messages are retried or sent again.
- 04If the problem continues after the fix, use the Orange contact form linked from its postmaster page and choose the option "Un problème d'envoi d'emails vers les adresses Orange ou Wanadoo (deliverability issue)".
Sources
What this page rests on, checked on 20 Oct 2026. The explanation is ours; the reply text is the server's.
- Orange Postmaster Page (SMTP Delivery Guidelines and Error Codes)postmaster.orange.fr
Related codes
- OFR_109Too many messages per connection.Your server sent more messages over one SMTP connection than Orange accepts. Orange recommends at most 100 messages per connection.
- 421Too many connections from your IP.Your server opened more simultaneous connections to a GMX mail server than one IP may hold. Wait for an open connection to close, then connect again.
- 421Too many parallel connections.Your server opened too many simultaneous connections to the t-online.de mail servers, so the extra ones were refused for now and the mail is delayed.
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