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1 .. _troubleshooting:
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2
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3 Troubleshooting
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4 ===============
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5
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16
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6 As a general rule, when you encounter an issue, always make sure that
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7 you use the `most recent version
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8 <http://www.orthanc-server.com/download.php>`__ of Orthanc.
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9
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10 Also make a search on the `Orthanc Users discussion group
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11 <https://groups.google.com/forum/#!forum/orthanc-users>`__, and make a
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12 search in the present Orthanc Book (there is a search field at the top
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13 of this page). Your issue might indeed have already been discussed in
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14 the past or in the FAQ.
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15
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16
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17 Orthanc Explorer
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18 ----------------
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19
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20 * **I cannot login to Orthanc Explorer**: For security reasons, access
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21 to Orthanc from remote hosts is disabled by default. Only the
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22 localhost is allowed to access Orthanc. You have to set the
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23 ``RemoteAccessAllowed`` option in the :ref:`configuration file
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24 <configuration>` to ``true``. It is then strongly advised to set
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25 ``AuthenticationEnabled`` to ``true`` and to add a user to the
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26 ``RegisteredUsers`` option, also in the configuration file.
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16
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27
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28
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29 Performance issues
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30 ------------------
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31
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41
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32 * **Run-time debug assertions**: If performance is important to you,
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33 make sure to add the option ``-DCMAKE_BUILD_TYPE=Release`` when
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34 invoking ``cmake`` while :ref:`compiling Orthanc
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35 <compiling>`. Indeed, by default, `run-time debug assertions
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36 <https://en.wikipedia.org/wiki/Assertion_(software_development)#Assertions_for_run-time_checking>`_
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37 are enabled, which can seriously impact performance, especially if
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38 your Orthanc server stores a lot of DICOM instances.
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39
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40 Note that the `official Docker images
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41 <https://github.com/jodogne/OrthancDocker>`__ of Orthanc <= 1.0.0
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42 were not compiled in ``Release`` mode. As a consequence, to improve
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43 performance, make sure to use either the mainline version of the
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43
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44 container (run ``docker pull jodogne/orthanc`` to ensure you use the
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45 most recent version of the mainline), or versions more recent than
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72
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46 ``jodogne/orthanc:1.2.0``.
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41
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47
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44
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48 * **Orthanc slows down if storing many files**: The default database
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49 engine that is built in Orthanc is `SQLite
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50 <https://www.sqlite.org/>`__. As SQLite is above all a lightweight
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51 database engine, it is not designed to `store very large datasets
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52 <https://www.sqlite.org/whentouse.html>`__. If you are sure that you
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53 have properly disabled run-time debug assertions (cf. above), but
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54 still experience degradation in performance over time, you should
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55 seriously consider switching to a more scalable database engine. To
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56 this end, you can notably check out the :ref:`official PostgreSQL
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57 plugin <postgresql>`.
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58
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59 As a rule of thumb, the performance of the default SQLite engine
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60 built in Orthanc should run fine up to about 50,000 DICOM instances.
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61
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62
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18
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63 * **Orthanc Explorer is slow under Windows on the localhost**:
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64
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65 - Favor ``127.0.0.1`` instead of ``localhost`` when specifying the
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66 network address of a server. Users have reported that this minor
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67 change `can massively improve performance
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68 <https://groups.google.com/d/msg/orthanc-users/tTe28zR0nGk/Lvs0STJLAgAJ>`__
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69 on Windows. Starting with Orthanc 1.0.1, the samples from the
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70 source distribution have been adapted in this way.
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71
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72 - As an alternative, you can disable IPv6 support. This is a
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73 Windows-specific problem that is discussed `here
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74 <http://superuser.com/questions/43823/google-chrome-is-slow-to-localhost>`__
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75 and `here
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76 <http://stackoverflow.com/questions/1726585/firefox-and-chrome-slow-on-localhost-known-fix-doesnt-work-on-windows-7>`__.
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77
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42
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78 * If you experience **slow DICOM transfers under GNU/Linux**, please
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79 read the `following bug report
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80 <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785400>`__. This
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81 issue does *not* affect all the versions of GNU/Linux. A patch to
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82 this issue is shipped with the Orthanc source code. In order to take
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83 advantage of this patch, you need to statically link Orthanc against
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84 DCMTK by using the ``-DUSE_SYSTEM_DCMTK=OFF`` flag `when invoking
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85 CMake
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86 <https://bitbucket.org/sjodogne/orthanc/src/default/LinuxCompilation.txt>`__.
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87
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88
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89 Windows-specific issues
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90 -----------------------
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91
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92 * Under Windows, Orthanc creates the "OrthancStorage" folder, and
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93 crashes with the error "**SQLite: Unable to open the database**":
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94 Your directory name is either too long, or it contains special
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95 characters. Please try and run Orthanc in a folder with a simple
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96 name such as ``C:\Orthanc``.
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55
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97
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98 * If **Orthanc crashes when handling one large DICOM file**, this most
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99 probably indicates a memory allocation error. Indeed, the `official
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100 Windows binaries
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101 <http://www.orthanc-server.com/download-windows.php>`__ are compiled
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102 using a 32bit compiler. As a consequence, Orthanc only has access to
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103 less than 4GB of RAM. If this is an important limitation for you,
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104 precompiled command-line versions of Orthanc for Windows 64bit are
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105 available courtesy of `Osimis
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106 <http://www.osimis.io/en/download.html>`__.
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