If this is Sage 100 Standard,   is there a firewall possibly blocking at the workstation?  Is there a difference in the DNS settings in windows?

If someone who is an administrator logs in at that workstation,  can they do e-mail.

Hello TomTarget,

Thank you for your reply!

All the client computers have Symantec Endpoint Protection (cloud version) with firewall.

Because of this Windows Firewall is disabled. All of them have identical settings on

the Symantec's firewall, but only one PC has this problem...

The DNS addresses are distributed by DHCP, and all the computers get the same information.

I looked at the workstation's event logs when the problem occurred, but there was no entry

related to Sage...

I reinstalled the client software with "Run as Administrator", but the problem persists.

Thank you,

TKU

Essentially,  the log is suggesting that it can't find the e-mail server let alone log in to it.

DNS translates a name for a website or e-mail server to an IP address that can be used to find it.   For example www.sage.com translates to some IP address (for example:  200.56.112.10 - not an actual ip address).

I'm going to say that something is not happening correctly in the DNS configuration for that workstation.  Need to talk to your IT support people.

Hi TomTarget,

Thank you for your reply.

If the DNS settings on the workstation is wrong, the workstation can't browse any websites.

But this workstation can. Even after flush the DNS cache on the workstation, it can browse

websites with no problem..

Nslookup the mail server on the workstation correctly translate it to the ip address...

Thank you,

TKU

Can you ping the mail server?

Ultimately it's going to come down to the issue that it can't get a connection to the mail server for whatever reason.   Something is different on that workstation.

Yes, it can both by the ip address and the host name.

This workstation is the only one with the problem.

I'm sure something is wrong with this workstation...

Reinstalling OS and everything may be easier and faster, but it's also a lot of work...

Thank you,

TKU

Did it ever work from this workstation?

If so you might try a restore point.

Yes, It worked before it was upgraded from Mas 90 to Sage 100 last October.

The problem started after the upgrade.

I checked the restore points, but unfortunately there wasn't no restore point

available before last October...

Thank you,

TKU

Ahhh,  a change between versions!

Seems like I remember running into an issue with a client in e-mail where the dll used for e-mailing changed between versions and caused some difficulties.  

Chilkat or something similar?

Wonder if doing an uninstall of the workstation setup and a reinstall (making sure you have administrator rights) might do it.

Yes, I suspect chilkatmail2.dll is acting strange.

The user on the workstation has the local admin right to the computer and the Sage 100 client

was reinstalled with "Run by Administrator" option a few days ago. But still no luck.

I think I may try that again...

Thank you,

TKU