Extensions Catalog in Plesk is not accessible: Failed connect to ext.plesk.com:

[mahesh]

Question:
Extensions Catalog in Plesk is not accessible: Failed connect to ext.plesk.com:443; No route to host
Symptoms

• The Extensions menu is not available and fails with:

Internal server error

• The following error in logged to the file /var/log/plesk/panel.log:

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ERR [extension/catalog] Failed connect to ext.plesk.com:443; No route to host


• A manual connection attempt to ext.plesk.com from CLI fails:

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#curl -vvv https://ext.plesk.com
* About to connect() to ext.plesk.com port 443 (#0)
* Trying 195.181.175.6...
* No route to host
* Failed connect to ext.plesk.com:443; No route to host
* Closing connection 0
curl: (7) Failed connect to ext.plesk.com:443; No route to host

• The host ext.plesk.com resolves a different IP address(s) from the one on the curl error above:

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host ext.plesk.com
ext.plesk.com is an alias for 1648825949.rsc.cdn77.org.
1648825949.rsc.cdn77.org has address 89.187.164.8
Cause
A record in /etc/hosts force the resolution of ext.plesk.com to an old or wrong IP address.

Resolution
1.Connect to the server using SSH.

2.Edit the /etc/hosts file.

3.Comment out the line(s) contaiting ext.plesk.com by adding a preceding # at the beginning of it, e.g.:

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#195.181.175.6 ext.plesk.com