Error in requests.post using static IP

[ekostero59]

Hi,
I need to have static IP in a number of pico-w which are posting to a web url data, When I have any pico to get dynamic IP from dhcp everything works ok.
When I change to static IP I am getting error -2 in the (requests.post(url, json=data, headers=headers)) function.
I will like to mention in the working lan the dynamic IP assignment in above x.x.x.100 and the working area for the pico is x.x.x.4x,
also with lan.scan I check that the IP's x.x.x.4x are free and the ifconfig values that I am passing apart from the IP are the same as ifconfig() values.
Any idea is welcome
Thanks

[shariltumin]

After you changed to static IP try:

1. ping your-gateway-IP
2. ping 1.1.1.1
3. ping 8.8.8.8

[ekostero59]

Gateway fails gets erno 104 econnreset 1.1.1.1 ok 8.8.8.8 ok Sent from Outlook for Android<https://aka.ms/AAb9ysg>

…

________________________________ From: shariltumin ***@***.***> Sent: Wednesday, July 23, 2025 6:37:03 PM To: micropython/micropython ***@***.***> Cc: Evan Kosteroglou ***@***.***>; Author ***@***.***> Subject: Re: [micropython/micropython] Error in requests.post using static IP (Discussion #17753) After you changed to static IP try: 1. ping your-gateway-IP 2. ping 1.1.1.1 3. ping 8.8.8.8 — Reply to this email directly, view it on GitHub<#17753 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BMSXQYLQ5DXFRG3NJIU7QDT3J6TZ7AVCNFSM6AAAAACCFYD3TGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGOBWGU2DMOA>. You are receiving this because you authored the thread.Message ID: ***@***.***> CONFIDENTIALITY & DISCLAIMER NOTICE All email communications may be monitored or recorded to secure effective system operation and for other lawful purposes. Internet communications are not always secure and therefore, the Company does not accept legal responsibility for the contents of this message and for any damage whatsoever that is caused by viruses or other malicious code being passed. Unless otherwise agreed expressly in writing by an authorized officer of the Company, this e-mail, including any attachments is to be treated as confidential, is intended solely for the addressee and the information in it may not be used or disclosed except for the purpose for which it has been sent. If you are not the intended recipient of this communication (or have received this e-mail in error) a) please notify the sender immediately and delete this e-mail and any attachments from your system and b) you should not disclose the content of this e-mail or any attachments to any other person or use them in any way. No employee is authorised to conclude any binding agreement on behalf of Company with another party by e-mail, without express written confirmation by an authorized officer of the Company.

[shariltumin]

Do you receive an answer when you ping the web server?

[ekostero59]

with this code
def tcp_ping(host="hub.mediflow.gr", port=53, timeout=3): addr = socket.getaddrinfo(host, port)[0][-1] s = socket.socket() s.settimeout(timeout)
try:
start = time.ticks_ms()
s.connect(addr)
s.close()
end = time.ticks_ms()
print(f"Ping to {host}:{port} - time={time.ticks_diff(end, start)} ms")
except Exception as e:
print(f"Ping failed: {e}")
`
I am getting the OSError -2 in the 'socket.getaddrinfo(host, port)[0][-1]'

    thanks a lot

an update, changing the port to 80 with static ip gets timeouts with dynamic ip it works fine

[shariltumin]

Try using '95.211.196.91' instead of 'hub.mediflow.gr'

You can also try this:

IP, NM, GW, NS = wlan.ifconfig()
SIP = '192.168.4.4' # Change to your static IP
NNS = '1.1.1.1'
wlan.ifconfig((NIP, NM, GW, NNS))
ping('95.211.196.91')
ping('hub.mediflow.gr')

[ekostero59]

This try can not go because this site is in a web sever and it cannot go directly to the 95.211.196.91.
As the only solution that I have found so far is to ask our IT to force the router to assign constant IP to specific MAC address and with this, I will use dynamic approach and I will get static IPs.
But I do not understand why it works with dynamic and not with static with any combination of gate ways and DNS servers
thanks again for your help

[shariltumin]

Are you sure? I can ping your web server by its IP address and hostname from my ESP32 board.
The problem with dynamic versus static IP addresses may be how your router handles its ARP table.
The point of sending a ping, i.e., an ICMP Echo Request, after changing to a new IP address is to update the router's ARP table.

In any case, I'm glad you solved the problem.

[ekostero59]

thanks a lot
Also your last approach , how to handle and the sequence .. , first connect to lan , after disable wlan.active change the IP as you did above , so far seems to work fine in two pico w