I found the answer: Code:  0x16  Description: Login_Required Explanation: F_RJT or P_RJT - An exchange is being initiated before the interchange of Service Parameters (i.e. Login) has been performed. F_RJT may be issued by the Fabric in order to notify an N_Port that a Login is required due to changes within the Fabric. 
Hi,  Could You please help me to solve a problem desribed below:  I have a VPLEX connected to 6510 switch and experienced the problem with single port, for which I suspect the fiber cable problem. The Device Name of Vplex frontend adapter port disappeared from nameserver and the path is not visible by servers.  The reject events are present in portlog. After portdisable/enable the port is able to log in to fabric and starts operating again.  Can anybody explain me the meaning of: FCPH       reject         16   from the output of portlogdumpport?  I suspect the 16 value may indicate a reject reason, which may be also related to increased value of PortErrShow counters. The increased enc_out counter can be observed but also slight discarded c3, link fail and c3 timeouts tx values.         frames            enc  crc   crc    too    too   bad    enc  disc  link   loss   loss   frjt   fbsy   c3timeout    pcs        tx     rx            in    err    g_eof shrt   long  eof    out   c3    fail    sync   sig                  tx    rx      err 12:  126.9k 445.1k   0      0      0      0      0      0    571      1      2      0      0      0      0      1      0      0 12:  126.9k 445.3k   0      0      0      0      0      0    571      1      2      0      0      0      0      1      0      0 12:  126.9k 445.5k   0      0      0      0      0      0    571      1      2      0      0      0      0      1      0      0 12:  126.9k 445.6k   0      0      0      0      0      0    571      1      2      0      0      0      0      1      0      0 12:  126.9k 445.8k   0      0      0      0      0      0    571      1      2      0      0      0      0      1      0      0 12:  126.9k 446.0k   0      0      0      0      0      0    571      1      2      0      0      0      0      1      0      0    portlogdumpport 12 |more time         task       event   port cmd  args ------------------------------------------------- Wed Mar  5 13:28:49 2014  16:15:06.849 PORT       switch   12       00000003,130bffff,0000001c,aabbcc04 16:15:06.849 FCPH       reject   12       16 16:15:11.980 PORT       Rx3      12  116  22fffffc,16000000,130affff,03000000 16:15:11.980 PORT       switch   12       00000003,130affff,0000001c,aabbcc04 16:15:11.980 FCPH       reject   12       16 16:15:17.117 PORT       Rx3      12  116  22fffffc,16000000,1309ffff,03000000 16:15:17.117 PORT       switch   12       00000003,1309ffff,0000001c,aabbcc04 16:15:17.117 FCPH       reject   12       16 16:15:22.226 PORT       Rx3      12  116  22fffffc,16000000,1308ffff,03000000 16:15:22.226 PORT       switch   12       00000003,1308ffff,0000001c,aabbcc04 16:15:22.226 FCPH       reject   12       16 16:15:27.340 PORT       Rx3      12  116  22fffffc,16000000,1307ffff,03000000 16:15:27.340 PORT       switch   12       00000003,1307ffff,0000001c,aabbcc04 16:15:27.340 FCPH       reject   12       16 16:15:32.453 PORT       Rx3      12  116  22fffffc,16000000,1306ffff,03000000 16:15:32.453 PORT       switch   12       00000003,1306ffff,0000001c,aabbcc04 16:15:32.453 FCPH       reject   12       16 16:15:37.559 PORT       Rx3      12  116  22fffffc,16000000,1305ffff,03000000 16:15:37.559 PORT       switch   12       00000003,1305ffff,0000001c,aabbcc04 16:15:37.559 FCPH       reject   12       16  and after portdisable/ portenable ...  16:15:39.167 INTR       pstate   12  OL1 16:15:39.173 PORT       scn      12   22  00010004,43020008,00000001 16:15:39.173 PORT       scn      12    2  83494378,ffffffff,00000002 16:15:39.173 PORT       scn      12    2  83494378,ffffffff,00000080 16:15:39.173 PORT       scn      12    5  00000000,00000000,00000002 16:15:39.173 PORT       scn      12    1  00010004,43020008,00000002 16:15:39.173 PORT       scn      12   22  00010004,43020008,00000001 16:15:39.187 PORT       ioctl    128010004  7,0 * 4 16:15:39.584 nsd0       rscn     12     0 00fffc15,1f030001,60150c00,00000001 16:15:45.384 SPEE       sn       12   NC  00000008,00000000,00000000 16:15:45.384 INTR       pstate   12  OL1 16:15:45.558 INTR       pstate   12   AC 16:15:45.564 PORT       scn      12   11  00000000,00000000,00000002 16:15:45.564 PORT       Rx3      12  116  22fffffe,00000000,0e0affff,04000000 16:15:45.565 PORT       scn      12    1  00000000,00000000,00000001 16:15:45.565 PORT       scn      12   22  00000000,00000000,00000010 16:15:45.565 PORT       scn      12    1  00000000,00000000,00000020 16:15:45.565 PORT       scn      12   22  00000000,00000000,00000008 16:15:45.597 PORT       Tx3      12  116  23150c00,00fffffe,0e0a22a2,02000000 16:15:45.597 PORT       Rx3      12  116  22fffffc,00150c00,0dd5ffff,03000000 16:15:45.598 PORT       Tx3      12  116  23150c00,00fffffc,0dd522a3,02000000 16:15:45.598 PORT       Rx3      12   52  02fffffc,00150c00,0e19ffff,01000000 16:15:45.599 nsd0       rscn     12fffc14 00fffc15,1b000000,c0000000,00000000 16:15:45.603 FCPH       read     12   52  02fffffc,00150c00,00000000,00000000,0e191e3f 16:15:45.603 FCPH       seq      12   34  20290000,0e191e3f,0000051a,0000001c,00000000 16:15:45.617 nsd0       ctin     12   fc  00030217,00150c00,00000100 16:15:45.620 nsd0       ctout    12   fc  00008002 16:15:45.620 FCPH       write    12   16  03150c00,00fffffc,00000000,00000000,0e191e3f 16:15:45.620 FCPH       seq      12   10  20980000,0e191e3f,00000575,0004001c,00000000 16:15:45.621 PORT       Tx3      12   16  03150c00,00fffffc,0e191e3f,01000000 16:15:45.621 PORT       Rx3      12  276  02fffffc,00150c00,0dd9ffff,01000000 16:15:45.621 FCPH       read     12  276  02fffffc,00150c00,00000000,00000000,0dd922a5 16:15:45.621 FCPH       seq      12  114  20290000,0dd922a5,0000051a,0000001c,00000000 16:15:45.622 nsd0       ctin     12   fc  00030218,00150c00,33454d43 16:15:45.622 nsd0       ctout    12   fc  00008002 16:15:45.622 FCPH       write    12   16  03150c00,00fffffc,00000000,00000000,0dd922a5 16:15:45.622 FCPH       seq      12   10  20980000,0dd922a5,00000575,0004001c,00000000 16:15:45.622 PORT       Tx3      12   16  03150c00,00fffffc,0dd922a5,01000000
portlogdumpport - FCPH reject reasons ?