Python socket.error: [Errno 111] Connection refused

The problem obviously was (as you figured it out) that port 36250 wasn’t open on the server side at the time you tried to connect (hence connection refused). I can see the server was supposed to open this socket after receiving SEND command on another connection, but it apparently was “not opening [it] up in sync with the client side”.

Well, the main reason would be there was no synchronisation whatsoever. Calling:

cs.send("SEND " + FILE)
cs.close()

would just place the data into a OS buffer; close would probably flush the data and push into the network, but it would almost certainly return before the data would reach the server. Adding sleep after close might mitigate the problem, but this is not synchronisation.

The correct solution would be to make sure the server has opened the connection. This would require server sending you some message back (for example OK, or better PORT 36250 to indicate where to connect). This would make sure the server is already listening.

The other thing is you must check the return values of send to make sure how many bytes was taken from your buffer. Or use sendall.

(Sorry for disturbing with this late answer, but I found this to be a high traffic question and I really didn’t like the sleep idea in the comments section.)

Related Posts:

  1. Python [Errno 98] Address already in use
  2. gaierror: [Errno 8] nodename nor servname provided, or not known (with macOS Sierra)
  3. Python [Errno 98] Address already in use
  4. Error: nodename nor servname provided, or not known (python sockets)
  5. gaierror: [Errno 8] nodename nor servname provided, or not known (with macOS Sierra)
  6. Python ConnectionRefusedError: [Errno 61] Connection refused
  7. What does socket binding mean?
  8. python socket programming OSError: [WinError 10038] an operation was attempted on something that is not a socket
  9. Sending string via socket (python)
  10. Getting “socket.error: [Errno 61] Connection refused” python paramiko
  11. Errno 10061 : No connection could be made because the target machine actively refused it ( client – server )
  12. How to set timeout on python’s socket recv method?
  13. Python Socket Receive Large Amount of Data
  14. UDP Client/Server Socket in Python
  15. Handling a timeout error in python sockets
  16. How do I copy a file in Python?
  17. Use Gif Logo For Loading Screen In Kivy
  18. How can I make a time delay in Python? [duplicate]
  19. Python – TypeError: ‘int’ object is not iterable
  20. are there dictionaries in javascript like python?
  21. How do I update\upgrade pip itself from inside my virtual environment?
  22. What does the “yield” keyword do?
  23. Renaming column names in Pandas
  24. Does Python have a string ‘contains’ substring method?
  25. Is there a “not equal” operator in Python?
  26. How do you append to a file?
  27. sklearn error ValueError: Input contains NaN, infinity or a value too large for dtype(‘float64’)
  28. Jupyter Notebook not saving: ‘_xsrf’ argument missing from post
  29. What does it mean to have an index to scalar variable error? python
  30. Could not install packages due to an EnvironmentError:
  31. What does “e” in “1e-5” in Python language mean and what is the name of this notation?
  32. How to avoid “RuntimeError: dictionary changed size during iteration” error?
  33. ‘Conda’ is not recognized as internal or external command
  34. `from … import` vs `import .` [duplicate]
  35. How to read a text file into a string variable and strip newlines?
  36. ln (Natural Log) in Python
  37. How can I remove a trailing newline?
  38. Is there a list of line styles in matplotlib?
  39. Import urllib.request, ImportError: No module named request
  40. TypeError: cannot convert the series to
  41. Get a list from Pandas DataFrame column headers
  42. ‘End of statement expected’ in pycharm
  43. How to import files in python using sys.path.append?
  44. How to create new folder?
  45. Python Sets vs Lists
  46. How do I resize an image using PIL and maintain its aspect ratio?
  47. Display image as grayscale using matplotlib
  48. AttributeError: ‘list’ object has no attribute ‘replace’ when trying to remove character
  49. PermissionError: [WinError 5] Access is denied
  50. Pytorch reshape tensor dimension
  51. How to iterate over columns of pandas dataframe to run regression
  52. JSON to pandas DataFrame
  53. Convert decimal to binary in python
  54. Python, print all floats to 2 decimal places in output
  55. RuntimeWarning: divide by zero encountered in log
  56. clang error: unknown argument: ‘-mno-fused-madd’ (python package installation failure)
  57. Deleting DataFrame row in Pandas based on column value
  58. Timeout on a function call
  59. Pandas long to wide reshape, by two variables
  60. how to create a list of lists
  61. Python – ‘ascii’ codec can’t decode byte
  62. Python assigning multiple variables to same value? list behavior
  63. IDLE’s subprocess didn’t make a connection. Either IDLE can’t start or personal firewall software is blocking the connection
  64. How to update a plot in matplotlib?
  65. ImportError: No module named MySQLdb
  66. What is the meaning of curly braces?
  67. Copy a list of list by value and not reference
  68. How do I print bold text in Python?
  69. python3 TypeError: ‘function’ object is not iterable
  70. pip connection failure: cannot fetch index base URL http://pypi.python.org/simple/
  71. Moving average or running mean
  72. Find which version of package is installed with pip
  73. What do the python file extensions, .pyc .pyd .pyo stand for?
  74. Python 3.6 No module named pip
  75. Difference between import tkinter as tk and from tkinter import
  76. Split function add: \xef\xbb\xbf…\n to my list
  77. ImportError in importing from sklearn: cannot import name check_build
  78. Root mean square of a function in python
  79. Installing opencv on Windows 10 with python 3.6 and anaconda 3.6
  80. H14 error in heroku – “no web processes running”
  81. Importing Pandas gives error AttributeError: module ‘pandas’ has no attribute ‘core’ in iPython Notebook
  82. What does this Django regular expression mean? `?P`
  83. Strange error about invalid syntax
  84. ‘virtualenv’ is not recognized as an internal or external command, operable program or batch file
  85. What is an easy way to implement fprintf in python?
  86. What is the recommended way to use Vim folding for Python code
  87. Plotting a python dict in order of key values
  88. How to normalize a NumPy array to within a certain range?
  89. How to check if a user is logged in (how to properly use user.is_authenticated)?
  90. Can I remove script tags with BeautifulSoup?
  91. gunicorn.errors.HaltServer: django
  92. What is a clean, Pythonic way to have multiple constructors in Python?
  93. Python Login Script; Usernames and Passwords in a separate file
  94. How to pass a list by reference?
  95. Python Quicksort Runtime Error: Maximum Recursion Depth Exceeded in cmp
  96. “for loop” with two variables?
  97. Python webbrowser.open() to open Chrome browser
  98. Flatten nested dictionaries, compressing keys
  99. Python 2.7 mixing iteration and read methods would lose data
  100. Conditional indexing with Numpy ndarray

Leave a Comment