Stelian, i need your help. our server went non-responsive and my investigation results in this: all worker threads were waiting here: 15: (IOLIB.STREAMS::%FILL-IBUF IOLIB.SOCKETS::SOCKET-READ-FN 15 #S(IOLIB.STREAMS::IOBUF :DATA #.(SB-SYS:INT-SAP #X00658620) :SIZE 4096 :START 0 :END 0)) 16: ((SB-GRAY:STREAM-READ-BYTE (IOLIB.STREAMS:DUAL-CHANNEL-GRAY-STREAM)) #<active IPv6 stream socket connected to ::ffff:81.183.137.134/1237 {100F6EEF71}>) looking at netstat shows that there are exactly as many of these as stuck threads: tcp6 0 0 192.168.101.105:8080 81.183.137.134:1249 ESTABLISHED 1004 736341 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1265 ESTABLISHED 1004 736356 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1261 ESTABLISHED 1004 736352 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1237 ESTABLISHED 1004 736329 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1281 ESTABLISHED 1004 736999 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1257 ESTABLISHED 1004 736348 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1273 ESTABLISHED 1004 736363 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1242 ESTABLISHED 1004 736336 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1253 ESTABLISHED 1004 736344 - tcp6 0 0 192.168.101.105:8080 81.183.137.134:1269 ESTABLISHED 1004 736360 - do you think that this remote host is really keeping the connection open? if so, do you think that it will help if i do this on the socket returned by accept: (setf (iolib:socket-option stream-socket :receive-timeout) 5) thanks in advance, -- attila