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Maybe the clientdev.abc.com uses the www.abc.com database. Also you can check clientdev.abc.com in general settings in WordPress the folder path and domain field.
Hi @scz,
It seems to me that you haven’t added the virtual host file for clientdev.abc.com properly or just that something is missing. Can you please further inspect there to see if everything is configured correctly?
If you are not sure how it is supposed to work, I’ll recommend checking out the following article as reference:
https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-ubuntu-18-04
Additionally, while writing the answer, I had another idea. It’s possible you have your home and site URLs in your clientdev.abc.com’s database set as abc.com which is why you are being redirected on accessing wp-admin. I’ll recommend checking out the databases of your Dev website and seeing if you have those configured there.
Regards, KFSys