Knowledge Base Hub

Browse through our helpful how-to guides to get the fastest solutions to your technical issues.

Home  >  How-Tos  >  How to Resolve 503 Error in Linux?
Top Scroll

How to Resolve 503 Error in Linux?

 3 min

There can be connectivity issues between the Linux servers hosting your application that cause the 503 service unavailable error. One of the easiest ways to fix the 503 service temporarily unavailable error is to follow this knowledge base article.

Step 1

First you have to check if the website is a node.js/python hosted website. If yes, then go for node.js/python solutions :

Nodejs :

Cpanel >>  node.js >> open the application >> switch  to  the source path from terminal >> run the application : npm start / node app.js runserver &  (main file  may be  app.js, test.js,depends)

If the  error  occurs  for : port is already in  use  then :
netstat -nap | grep :port no.
lsof -p 21069

where 21069 = pid

kill -9 21069

Restart the  application and again run the application.

Check whether the website  is  proxy based or not,in that order check the proxy.

Python :

Cpanel >>  node.js >> open the application >> switch  to  the source path from terminal >> run the application : python3 runserveror python runserver &

Follow the  steps as above as for  node.js

Step 2  

You need to check the resources of the account. If they are high, you need to optimize the resources of the account.

Step 3

Check if there is load on the server. If yes, reduce the server load.

Step 4  

Enable debug mode for the website (If WP site >>in wp-config, edit  the value  of debug from false to  true  /  If other  site  then enable  the debug logs  from php ini editor  in cPanel  ) Exact error will get displayed on the site.)

Step 5

Here is the error that you will get on the screen.

Error :

You will get a memory exhaust error message.

*Allowed memory size of 41943040 bytes exhausted (tried to allocate 32768 bytes) in /home/mumbai/public_html/wp-content/plugins/userswp/vendor/ayecode/wp-super-duper/wp-super-duper.php on line 3060:

To resolve such errors, Increase the values in the multi PHP INI editor.”

Step 6  

If error is related to plugin/theme, then scan the security measures from wp-toolkit, and then you must know that there is error for  the respective plugin , theme ,

Ask the web hosts tech team to disable the plugin, with no changes in the theme.

Step 7  

Check applying different suitable PHP versions to the site (On priority: 5.6, 7.3, 8.0 and above).

That is how you can resolve 503 error on Linux operating systems compatible servers.

For our Knowledge Base visitors only
Get 10% OFF on Hosting
Special Offer!
Claim the discount before it’s too late. Use the coupon code:
Note: Copy the coupon code and apply it on checkout.