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Environment/Versions VisionWorks: All Versions Answer Example of error: The physical probes / test sets use TL1 language to run tests.  The language includes a Test Session Number, (TSN), that is used to track the test commands and results.  The Test Session Number is a number between 1 and 999.  Each test that runs on the probe will have a TSN for the duration of the test.  While a TSN is in use on a probe, no other test is allowed to start on the probe with the same TSN.  If it does, the error "CONN-TACC-ETH got a DENY (SNVS) / Test session override not allowed / " will occur.    To get around this error, retry your test access. You can see what TSN are in use on a probe with command: RTRV-COND-TST:::CTAG; Example.  On this probe, currently TSN 41 and 5 are in use. RTRV-COND-TST:::CTAG;IP CTAG <OK 0 <OK 0 <    STCLIVE-7500C 21-11-12 19:07:40 M  CTAG COMPLD    /* SPIRENT COMMUNICATIONS OF ROCKVILLE - COPYRIGHT (C) 2009-2021              */    /* TSN PORT VLAN      PRI SRC_IP          CIR       KFPS  DES_ADDR            */    /*                                       STATUS                     TYPE      */    "  41  1                  1.1.1.10  10.0      3       "    "                                        TST-PING-PM                           "    "  5   1    104           1.1.1.22  1.0       5       "    "                                        START-TWAMP-SERVER                    " ;