Ahh network tuning... A black art that when needed soon turns into a set of rather random numbers that only work for a given set of dependencies. (kernel, hardware, application, etc). Some numbers give good performance for TCP but is terrible for UDP latency. Others can cause packet corruption that gets all the way to userland (overrun a nics hardware ring buffer 'post' checksum offload it’s a really entertaining one to diagnose). Performance test from low to high loads including flash crowd load. Graph outcomes for all performance metrics. Change one tunable (or related set), re-run and see if it's made a useful difference. Repeat again and again... be prepared to do it all again on the next upgrade. Or just pay for more and cheaper compute / hardware gaining resilience and scaling at the cost of power, space and cooling (if not public cloud). Sad the auto-tuning and normal settings are almost always sub-optimal on any server that’s actually doing useful amounts of work. A. On 28/04/2020, 22:28, "Freeradius-Users on behalf of Aurélio de Souza Ribeiro Neto" <freeradius-users-bounces+alister.winfield=sky.uk@lists.freeradius.org on behalf of netolistas@mpc.com.br> wrote: Alan, >> When it happens I have this messages in freeradius LOGs: >> >> WARNING: (131915) WARNING: Module rlm_sql became unblocked >> Error: Received conflicting packet from client ce-popfd-rb port >> 49756 - ID: 101 due to unfinished request in module sql. Giving up on >> old request >> >> What I need to adjust do solve this issue? > Make the MySQL server respond quickly. The "rlm_sql became unblocked" message comes out because the SQL server didn't respond to one query for *many* seconds. > > No amount of poking FreeRADIUS will fix this issue. It's either a slow database, or a network issue which causes connections to be blocked. > > Alan DeKok. You´re right! Was a network problem. I want to thank and share how I solved my "problem" . After check all my hardware and sure that I don´t have any problem, I found a problem in my Ubuntu TCP/IP tuning (database server)! I did the steps found in https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdom.as%2F2006%2F09%2F12%2Fmysql-tcp-network-tuning%2F&data=02%7C01%7Calister.winfield%40sky.uk%7C906bfd756f394912aad208d7ebbb176d%7C68b865d5cf184b2b82a4a4eddb9c5237%7C0%7C1%7C637237061101245052&sdata=tgXpTtIMj3rUAusBdJzdvY19ibMrLnxwgIUcUzFj5CE%3D&reserved=0 and haven´t no more messags from module_rlm_sql! Thank you again Aurélio > > - > List info/subscribe/unsubscribe? See https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.freeradius.org%2Flist%2Fusers.html&data=02%7C01%7Calister.winfield%40sky.uk%7C906bfd756f394912aad208d7ebbb176d%7C68b865d5cf184b2b82a4a4eddb9c5237%7C0%7C1%7C637237061101245052&sdata=WBX6gxJrizSKayU8oW%2FCUMPzhxHs2MZAesi1wQdWb70%3D&reserved=0 - List info/subscribe/unsubscribe? See https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.freeradius.org%2Flist%2Fusers.html&data=02%7C01%7Calister.winfield%40sky.uk%7C906bfd756f394912aad208d7ebbb176d%7C68b865d5cf184b2b82a4a4eddb9c5237%7C0%7C1%7C637237061101245052&sdata=WBX6gxJrizSKayU8oW%2FCUMPzhxHs2MZAesi1wQdWb70%3D&reserved=0 -------------------------------------------------------------------- This email is from an external source. Please do not open attachments or click links from an unknown or suspicious origin. Phishing attempts can be reported by sending them to phishing@sky.uk as attachments. Thank you -------------------------------------------------------------------- Information in this email including any attachments may be privileged, confidential and is intended exclusively for the addressee. The views expressed may not be official policy, but the personal views of the originator. If you have received it in error, please notify the sender by return e-mail and delete it from your system. You should not reproduce, distribute, store, retransmit, use or disclose its contents to anyone. Please note we reserve the right to monitor all e-mail communication through our internal and external networks. SKY and the SKY marks are trademarks of Sky Limited and Sky International AG and are used under licence. Sky UK Limited (Registration No. 2906991), Sky-In-Home Service Limited (Registration No. 2067075), Sky Subscribers Services Limited (Registration No. 2340150) and Sky CP Limited (Registration No. 9513259) are direct or indirect subsidiaries of Sky Limited (Registration No. 2247735). All of the companies mentioned in this paragraph are incorporated in England and Wales and share the same registered office at Grant Way, Isleworth, Middlesex TW7 5QD