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Invalid entries in the DNS settings for the IBM i can cause s= evere performance issues notable in the slow display of Zend Server UI, and= also in the slow start up of the IBM i Apache instances and difficulty usi= ng the IBM i web based Navigator.
Note: Partially blank Zend Server UI p= ages can also be helped by setting longer timeouts.
Any version of Zend Server for IBM i, running on any supporte= d version of IBM i OS
The Domain Name Server (DNS) contains a directory of domain n= ames (example zend.com) and their associated IP addresses (example 162.209.30= .134). Typically you will have two or more DNS to provide some redund= ancy. You IT department can provide you with valid DNS IP addresses t= hat should be used from within your network. These DNS IP addresses a= re stored on your IBM i using the CHGTCPDMN command or a menu option from C= FGTCP.
The first step is to verify that the DNS entries on your IBM = i are valid for your IBM i. Please log in to a 5250 session using a *= SECOFR class user profile. From the command line:
cfgtcp
This should bring up t= he "Configure TCP/IP" menu.
Use option "12. Change TCP/IP domain information". Page= down to see the "Domain name server:" prompt. Make a note of each of= the Internet address entries. These are the IP addresses for the DNS= . Use F12 to return to the menu.
On the command line, attempt to ping each DNS IP address.&nbs= p; For example, if the address was 208.67.222.222, you could ping it with t= his command:
ping '208.67.222.222'
Note the IP address is in single quotes.&nbs= p; Look at the message line on your display to see the results of the ping.= Position the cursor on the message line so you can scroll through th= e messages using the page down and page up buttons. If the ping is su= ccessful, you will see a "Verifying connection" message, then 5 "Ping reply= " messages that tell how long each of the 5 replies took to receive, in mil= liseconds. Then a message about "Round-trip min/avg/max" and finally = a message indicating "5 of 5 successful". If the ping is valid, the D= NS server is reachable from your IBM i, and this is probably not your issue= .
If the ping fails you will see "No response messages" and the= final message will show "0 of 5 successful".
If the ping fails for any IP Address you have in the "Change = TCP/IP Domain (CHGTCPDMN)" display, use the CHGTCPDMN command or option "12= . Change TCP/IP domain information" to remove it. You can then restar= t Zend Server, and should see better performance in the Zend Server UI.&nbs= p; You can also restart the ADMIN instance of Apache to see if this improve= s the performance of Navigator in the web (see link to IBM SUpport article,= below).
You should have valid DNS entries on your IBM i, so if you di= scover bad entries, please work with your IT department to verify that you = have the correct IP addresses, and that there is nothing in the network tha= t is blocking the IBM i from accessing the DNS. When you have it all = set up, please test again with the ping command to make sure that the IBM i= can access the IP addresses.
To learn more, and to learn how to restart the ADMIN instance= of Apache, please review this article from IBM Support:
IBM Navigator for i, N= avigation Missing or Unresponsive