IIS API Issue

Question

IIS API Issue

Mohammed Nadeem 161

We have IIS based API which triggers Bank URL for transaction. URL had stopped opening from particular physical server. also Firwall Engineer had informed us that connection is getting reset from server itself and was able to telnet port 443 and issue has been resolved by restarting the server. What could be issue for resetting the connection.

Reza-Ameri 17,336 Reputation points Volunteer Moderator

2023-04-08T10:21:41.88+00:00

It is hard to say what causing this issue but I advise you to check log files and you might find some clues there.
Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2023-04-08T23:48:11.59+00:00

To get started, you need to read HTTP API error logs https://learn.microsoft.com/en-us/troubleshoot/developer/webapps/aspnet/site-behavior-performance/error-logging-http-apis, usually at %SystemRoot%\System32\LogFiles\HTTPERR
Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff

2023-04-10T02:58:40.69+00:00

@Mohammed Nadeem Did you get the status code? You can check if there are related error messages in the iis log(IIS log files are stored by default in the %SystemDrive%\inetpub\logs\LogFiles folder of your IIS server), if not, you can use failed request tracking to view detailed error information.

2 answers

Your answer

Reza-Ameri 17,336 Reputation points Volunteer Moderator

2023-04-08T10:21:41.88+00:00

It is hard to say what causing this issue but I advise you to check log files and you might find some clues there.
Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2023-04-08T23:48:11.59+00:00

To get started, you need to read HTTP API error logs https://learn.microsoft.com/en-us/troubleshoot/developer/webapps/aspnet/site-behavior-performance/error-logging-http-apis, usually at %SystemRoot%\System32\LogFiles\HTTPERR
Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff

2023-04-10T02:58:40.69+00:00

@Mohammed Nadeem Did you get the status code? You can check if there are related error messages in the iis log(IIS log files are stored by default in the %SystemDrive%\inetpub\logs\LogFiles folder of your IIS server), if not, you can use failed request tracking to view detailed error information.

Answer 1

There could be various reasons why the connection was being reset from the server side. Some possible reasons are:

Network connectivity issues: There could be network connectivity issues due to which the connection was being reset. This could be due to issues with the network adapter or network drivers, misconfigured network settings, or issues with the physical network cables.

Firewall or security settings: The firewall or security settings on the server could be blocking the connection to the Bank URL. This could be due to firewall rules or settings that block traffic on port 443, or other security settings that are preventing the server from making a connection.

Resource constraints: The server could be experiencing resource constraints, such as low memory, CPU usage, or disk space, which could be causing the connection to reset.

Application or service issues: There could be issues with the IIS-based API or the service that is calling the Bank URL, which could be causing the connection to reset. This could be due to bugs or other issues with the code, or issues with the configuration or setup of the service.

To further investigate the issue, you may need to review server logs and network traces to identify the cause of the connection reset.

Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2023-04-08T23:45:57.31+00:00

"Firwall Engineer had informed us that connection is getting reset from server itself" has already ruled out many of what you typed (or copied from somewhere).

Answer 2

Mohammed Nadeem 161

Hi, Also note that this server has multiple APIs but only particular bank api caused the issue and May I know which logs should be checked as I did't get information on windows system\application logs. Also I got below message from HTTPERR logs 2023-04-06 13:47:20 x.x.x.x 58524 x.x.x.x 67 HTTP/1.1 POST /api/Api - 16 Connection_Abandoned_By_ReqQueue API

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IIS API Issue

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