Hello Rich, list, Earlier today we started getting this error in our FDS error log repeatedly. Obviously connections were being refused at this point. I had to restart the directory server for the server to function again. Prior to releasing this box into production I did set the parameters according to the Installation guide specifications. The output of "ulimit -n" is 8192. The output of "sysctl -p" is below.(I increased fs.file-max from 64000)Does anything look off? net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_keepalive_time = 300 fs.file-max = 128000 net.ipv4.ip_local_port_range = 1024 65000 I also changed the setting in the config from nsslapd-maxdescriptors: 1024 to nsslapd-maxdescriptors: 8192 Is there a way to tweak these settings so that this will not happen in the future? This is a dedicated consumer or read only replica. Directory size is roughly 20,000 users. We are running FC9 and FDS 1.1.1-3. We are lacking in RAM but look to improve on that shortly. I do see on the web past posts to this list regarding this error, I am currently looking through them. Is there anyone out there that has experienced this and gotten past it? Thanks James [25/Feb/2009:13:30:08 -0600] - Not listening for new connections - too many fds open [25/Feb/2009:13:30:08 -0600] - Listening for new connections again [25/Feb/2009:13:30:08 -0600] - Not listening for new connections - too many fds open [25/Feb/2009:13:30:08 -0600] - Listening for new connections again CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity.