After sending few request to horizon or running horizon for sometime, getting too many open files:443 error. Then I have restarted the horizon then above error is removed.Is there any configuration I need to add?
Are you sure it's 443 or do you confuse the number with the https port? However horizon has a rate limit by default, so a "429 Too Many Requests" response could be likely (=> How do I disable rate limiting on my local Horizon server?). Otherwise some more details on where exactly you get the errors (horizon logs? client sdk something?) and what exactly is the message.